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Re: "Tramp failed to connect" to an ssh server (gpg as an ssh agent)

From: Daniel Krajnik
Subject: Re: "Tramp failed to connect" to an ssh server (gpg as an ssh agent)
Date: Fri, 8 Sep 2023 14:02:51 +0100
User-agent: Mozilla Thunderbird
Apologies Micheal for sending this message twice - I'm new to mailing lists and I forgot to add CC.
Thank you, it seems to get stuck on a few tramp functions freezing emacs - however it returns after I physically remove the gpg smart card. Please see the truncated output from the debug buffer below.
The port number here is different from the previous example, because I've uninstalled the other machine just yesterday. There is however another one available to sshh under the same IP address.
   1   │ ;; Emacs: 29.1 Tramp: 2.6.0.29.1 -*- mode: outline; coding: utf-8; -*-    2   │ 13:30:27.776549 tramp-maybe-open-connection (3) # Opening connection nil for 128.40.123.56 using ssh... 
   3   │ 13:30:27.776621 tramp-call-process (6) # ‘locale -a’ nil *temp*
   4   │ 13:30:27.777637 tramp-call-process (6) # 0
   5   │ C
   6   │ C.UTF-8
   7   │ en_GB.utf8
   8   │ en_US.utf8
   9   │ POSIX
  10   │ 13:30:27.777725 tramp-ssh-controlmaster-options (4) # Computing ControlMaster options...   11   │ 13:30:27.777751 tramp-call-process (6) # ‘ssh -G -o ControlMaster=auto 0.0.0.1’ nil nil 
  12   │ 13:30:27.781422 tramp-call-process (6) # 0
  13   │ Pseudo-terminal will not be allocated because stdin is not a terminal. 
  14   │ host 0.0.0.1
  15   │ user user1
  16   │ hostname 0.0.0.1
  17   │ port 22
  18   │ addressfamily any
  19   │ batchmode no
  20   │ canonicalizefallbacklocal yes
  21   │ canonicalizehostname false
  22   │ checkhostip no
  23   │ compression no
  24   │ controlmaster auto
  25   │ enablesshkeysign no
  26   │ clearallforwardings no
  27   │ exitonforwardfailure no
  28   │ fingerprinthash SHA256
  29   │ forwardx11 no
  30   │ forwardx11trusted no
  31   │ gatewayports no
  32   │ gssapiauthentication no
  33   │ gssapidelegatecredentials no
  34   │ hashknownhosts no
  35   │ hostbasedauthentication no
  36   │ identitiesonly no
  37   │ kbdinteractiveauthentication yes
  38   │ nohostauthenticationforlocalhost no
  39   │ passwordauthentication yes
  40   │ permitlocalcommand no
  41   │ proxyusefdpass no
  42   │ pubkeyauthentication true
  43   │ requesttty auto
  44   │ sessiontype default
  45   │ stdinnull no
  46   │ forkafterauthentication no
  47   │ streamlocalbindunlink no
  48   │ stricthostkeychecking ask
  49   │ tcpkeepalive yes
  50   │ tunnel false
  51   │ verifyhostkeydns false
  52   │ visualhostkey no
  53   │ updatehostkeys true
  54   │ enableescapecommandline no
  55   │ canonicalizemaxdots 1
  56   │ connectionattempts 1
  57   │ forwardx11timeout 1200
  58   │ numberofpasswordprompts 3
  59   │ serveralivecountmax 3
  60   │ serveraliveinterval 0
  61   │ requiredrsasize 1024
  62   │ ciphers chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com   63   │ hostkeyalgorithms ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@>   64   │ hostbasedacceptedalgorithms ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256>   65   │ kexalgorithms sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256   66   │ casignaturealgorithms ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-512,rsa-sha2-256 
  67   │ loglevel INFO
  68   │ macs umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 
  69   │ securitykeyprovider internal
  70   │ pubkeyacceptedalgorithms ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-ce> 
  71   │ xauthlocation /usr/bin/xauth
  72   │ identityfile ~/.ssh/id_rsa
  73   │ identityfile ~/.ssh/id_ecdsa
  74   │ identityfile ~/.ssh/id_ecdsa_sk
  75   │ identityfile ~/.ssh/id_ed25519
  76   │ identityfile ~/.ssh/id_ed25519_sk
  77   │ identityfile ~/.ssh/id_xmss
  78   │ identityfile ~/.ssh/id_dsa

  79   │ canonicaldomains none
  80   │ globalknownhostsfile /etc/ssh/ssh_known_hosts /etc/ssh/ssh_known_hosts2   81   │ userknownhostsfile /home/user1/.ssh/known_hosts /home/user1/.ssh/known_hosts2 
  82   │ logverbose none
  83   │ permitremoteopen any
  84   │ addkeystoagent false
  85   │ forwardagent no
  86   │ connecttimeout none
  87   │ tunneldevice any:any
  88   │ canonicalizePermittedcnames none
  89   │ controlpersist no
  90   │ escapechar ~
  91   │ ipqos af21 cs1
  92   │ rekeylimit 0 0
  93   │ streamlocalbindmask 0177
  94   │ syslogfacility USER
  95   │ 13:30:27.781488 tramp-call-process (6) # ‘ssh -G -o ControlPath=tramp.%C 0.0.0.1’ nil nil 
  96   │ 13:30:27.785156 tramp-call-process (6) # 0
  97   │ Pseudo-terminal will not be allocated because stdin is not a terminal. 
  98   │ host 0.0.0.1
  99   │ user user1
 100   │ hostname 0.0.0.1
 101   │ port 22
 102   │ addressfamily any
 103   │ batchmode no
 104   │ canonicalizefallbacklocal yes
 105   │ canonicalizehostname false
 106   │ checkhostip no
 107   │ compression no
 108   │ controlmaster false
 109   │ enablesshkeysign no
 110   │ clearallforwardings no
 111   │ exitonforwardfailure no
 112   │ fingerprinthash SHA256
 113   │ forwardx11 no
 114   │ forwardx11trusted no
 115   │ gatewayports no
 116   │ gssapiauthentication no
 117   │ gssapidelegatecredentials no
 118   │ hashknownhosts no
 119   │ hostbasedauthentication no
 120   │ identitiesonly no
 121   │ kbdinteractiveauthentication yes
 122   │ nohostauthenticationforlocalhost no
 123   │ passwordauthentication yes
 124   │ permitlocalcommand no
 125   │ proxyusefdpass no
 126   │ pubkeyauthentication true
 127   │ requesttty auto
 128   │ sessiontype default
 129   │ stdinnull no
 130   │ forkafterauthentication no
 131   │ streamlocalbindunlink no
 132   │ stricthostkeychecking ask
 133   │ tcpkeepalive yes
 134   │ tunnel false
 135   │ verifyhostkeydns false
 136   │ visualhostkey no
 137   │ updatehostkeys true
 138   │ enableescapecommandline no
 139   │ canonicalizemaxdots 1
 140   │ connectionattempts 1
 141   │ forwardx11timeout 1200
 142   │ numberofpasswordprompts 3
 143   │ serveralivecountmax 3
 144   │ serveraliveinterval 0
 145   │ requiredrsasize 1024
 146   │ ciphers chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com 
 147   │ controlpath tramp.1a00b371201ef2c9ec1e6cd86415704fff3b2544
 148   │ hostkeyalgorithms ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@>  149   │ hostbasedacceptedalgorithms ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256>  150   │ kexalgorithms sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256  151   │ casignaturealgorithms ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-512,rsa-sha2-256 
 152   │ loglevel INFO
 153   │ macs umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 
 154   │ securitykeyprovider internal
 155   │ pubkeyacceptedalgorithms ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-ce> 
 156   │ xauthlocation /usr/bin/xauth
 157   │ identityfile ~/.ssh/id_rsa
 158   │ identityfile ~/.ssh/id_ecdsa
 159   │ identityfile ~/.ssh/id_ecdsa_sk
 160   │ identityfile ~/.ssh/id_ed25519
 161   │ identityfile ~/.ssh/id_ed25519_sk
 162   │ identityfile ~/.ssh/id_xmss
 163   │ identityfile ~/.ssh/id_dsa
 164   │ canonicaldomains none
 165   │ globalknownhostsfile /etc/ssh/ssh_known_hosts /etc/ssh/ssh_known_hosts2  166   │ userknownhostsfile /home/user1/.ssh/known_hosts /home/user1/.ssh/known_hosts2 
 167   │ logverbose none
 168   │ permitremoteopen any
 169   │ addkeystoagent false
 170   │ forwardagent no
 171   │ connecttimeout none
 172   │ tunneldevice any:any
 173   │ canonicalizePermittedcnames none
 174   │ controlpersist no
 175   │ escapechar ~
 176   │ ipqos af21 cs1
 177   │ rekeylimit 0 0
 178   │ streamlocalbindmask 0177
 179   │ syslogfacility USER
 180   │ 13:30:27.785240 tramp-call-process (6) # ‘ssh -G -o ControlPersist=no 0.0.0.1’ nil nil 
 181   │ 13:30:27.788630 tramp-call-process (6) # 0
 182   │ Pseudo-terminal will not be allocated because stdin is not a terminal. 
 183   │ host 0.0.0.1
 184   │ user user1
 185   │ hostname 0.0.0.1
 186   │ port 22
 187   │ addressfamily any
 188   │ batchmode no
 189   │ canonicalizefallbacklocal yes
 190   │ canonicalizehostname false
 191   │ checkhostip no
 192   │ compression no
 193   │ controlmaster false
 194   │ enablesshkeysign no
 195   │ clearallforwardings no
 196   │ exitonforwardfailure no
 197   │ fingerprinthash SHA256
 198   │ forwardx11 no
 199   │ forwardx11trusted no
 200   │ gatewayports no
 201   │ gssapiauthentication no
 202   │ gssapidelegatecredentials no
 203   │ hashknownhosts no
 204   │ hostbasedauthentication no
 205   │ identitiesonly no
 206   │ kbdinteractiveauthentication yes
 207   │ nohostauthenticationforlocalhost no
 208   │ passwordauthentication yes
 209   │ permitlocalcommand no
 210   │ proxyusefdpass no
 211   │ pubkeyauthentication true
 212   │ requesttty auto
 213   │ sessiontype default
 214   │ stdinnull no
 215   │ forkafterauthentication no
 216   │ streamlocalbindunlink no
 217   │ stricthostkeychecking ask
 218   │ tcpkeepalive yes
 219   │ tunnel false
 220   │ verifyhostkeydns false
 221   │ visualhostkey no
 222   │ updatehostkeys true
 223   │ enableescapecommandline no
 224   │ canonicalizemaxdots 1
 225   │ connectionattempts 1
 226   │ forwardx11timeout 1200
 227   │ numberofpasswordprompts 3
 228   │ serveralivecountmax 3
 229   │ serveraliveinterval 0
 230   │ requiredrsasize 1024
 231   │ ciphers chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com  232   │ hostkeyalgorithms ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@>  233   │ hostbasedacceptedalgorithms ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256>  234   │ kexalgorithms sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256  235   │ casignaturealgorithms ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-512,rsa-sha2-256 
 236   │ loglevel INFO
 237   │ macs umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 
 238   │ securitykeyprovider internal
 239   │ pubkeyacceptedalgorithms ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-ce> 
 240   │ xauthlocation /usr/bin/xauth
 241   │ identityfile ~/.ssh/id_rsa
 242   │ identityfile ~/.ssh/id_ecdsa
 243   │ identityfile ~/.ssh/id_ecdsa_sk
 244   │ identityfile ~/.ssh/id_ed25519
 245   │ identityfile ~/.ssh/id_ed25519_sk
 246   │ identityfile ~/.ssh/id_xmss
 247   │ identityfile ~/.ssh/id_dsa
 248   │ canonicaldomains none
 249   │ globalknownhostsfile /etc/ssh/ssh_known_hosts /etc/ssh/ssh_known_hosts2  250   │ userknownhostsfile /home/user1/.ssh/known_hosts /home/user1/.ssh/known_hosts2 
 251   │ logverbose none
 252   │ permitremoteopen any
 253   │ addkeystoagent false
 254   │ forwardagent no
 255   │ connecttimeout none
 256   │ tunneldevice any:any
 257   │ canonicalizePermittedcnames none
 258   │ controlpersist no
 259   │ escapechar ~
 260   │ ipqos af21 cs1
 261   │ rekeylimit 0 0
 262   │ streamlocalbindmask 0177
 263   │ syslogfacility USER
 264   │ 13:30:27.788711 tramp-ssh-controlmaster-options (4) # Computing ControlMaster options...done 
 265   │ 13:30:27.788989 tramp-maybe-open-connection (6) # /bin/sh -i
 266   │ 13:30:27.790897 tramp-wait-for-regexp (6) #
 267   │ #$
 268   │ 13:30:27.791050 tramp-maybe-open-connection (3) # Sending command ‘exec ssh -o ControlMaster=auto -o ControlPath=tramp.%C -o ControlPersist=no -e none 128.40.123.56’  269   │ 13:30:27.791080 tramp-send-command (6) # exec ssh -o ControlMaster=auto -o ControlPath=tramp.%C -o ControlPersist=no -e none 128.40.123.56  270   │ 13:30:27.791149 tramp-process-actions (3) # Waiting for prompts from remote shell...  271   │ 13:30:27.791202 tramp-process-one-action (5) # Looking for regexp "\(.*\(?:login\|user\)\(?:[[:blank:]].*\)?:[[:blank:]]*\)\'" from remote shell  272   │ 13:30:27.791262 tramp-process-one-action (5) # Looking for regexp "\(^.*\(\(?:adgangskode\|contrase\(?:\(?:ny\|ñ\)a\)\|decryption key\|encryption key\|geslo\|h\(?:\(?:asł\|esl\)o\)\|iphasiwedi\|jelszó\|l\(?:ozinka\|ösenord\)\|m\(?:ot de passe\|ật khẩu\)\|p\(?:a\(?:rola\|s\(?:ahitza\|s\(?: phrase\|code\|ord\|p>  273   │ 13:30:27.791309 tramp-process-one-action (5) # Looking for regexp "\(^.*\(?:Permission denied\|Login \(?:[Ii]ncorrect\)\|Connection refused\|Connection closed\|Timeout, server not responding\.\|Sorry, try again\.\|Name or service not known\|Host key verification failed\.\|No supported authentication methods l>  274   │ 13:30:27.791345 tramp-process-one-action (5) # Looking for regexp "\(^[^#$%> 
 275   │ ]*[#$%>] *\)\'" from remote shell
 276   │ 13:30:27.791383 tramp-process-one-action (5) # Looking for regexp "\(\(?:^\|^M\)[^]  277   │ #-%>]*#?[]#-%>][[:blank:]]*\(?:[[;[:digit:]]*[[:alpha:]][[:blank:]]*\)*\)\'" from remote shell  278   │ 13:30:27.791413 tramp-process-one-action (5) # Looking for regexp "\(Are you sure you want to continue connecting (yes/no\(?:/\[fingerprint]\)?)\?[[:blank:]]*\)\'" from remote shell  279   │ 13:30:27.791440 tramp-process-one-action (5) # Looking for regexp "\(\(?:Store key in cache\? (y/n.*)\|Update cached key\? (y/n, Return cancels connection)\)[[:blank:]]*\)\'" from remote shell  280   │ 13:30:27.791465 tramp-process-one-action (5) # Looking for regexp "\(\(?:TERM = (.*)\|Terminal type\? \[.*]\)[[:blank:]]*\)\'" from remote shell  281   │ 13:30:27.791490 tramp-process-one-action (5) # Looking for regexp "\(Access granted\. Press Return to begin session\. \)\'" from remote shell  282   │ 13:30:27.791549 tramp-process-one-action (5) # Looking for regexp "\(^^M*Confirm user presence for key .*[ 
 283   │ ^M]*\)\'" from remote shell
 284   │ 13:30:27.791587 tramp-process-one-action (5) # Looking for regexp "\(\)\'" from remote shell  285   │ 13:30:27.791645 tramp-process-one-action (5) # Call ‘tramp-action-process-alive’  286   │ 13:30:27.791690 tramp-process-one-action (5) # Looking for regexp "\(.*\(?:login\|user\)\(?:[[:blank:]].*\)?:[[:blank:]]*\)\'" from remote shell  287   │ 13:30:27.791724 tramp-process-one-action (5) # Looking for regexp "\(^.*\(\(?:adgangskode\|contrase\(?:\(?:ny\|ñ\)a\)\|decryption key\|encryption key\|geslo\|h\(?:\(?:asł\|esl\)o\)\|iphasiwedi\|jelszó\|l\(?:ozinka\|ösenord\)\|m\(?:ot de passe\|ật khẩu\)\|p\(?:a\(?:rola\|s\(?:ahitza\|s\(?: phrase\|code\|ord\|p>  288   │ 13:30:27.791760 tramp-process-one-action (5) # Looking for regexp "\(^.*\(?:Permission denied\|Login \(?:[Ii]ncorrect\)\|Connection refused\|Connection closed\|Timeout, server not responding\.\|Sorry, try again\.\|Name or service not known\|Host key verification failed\.\|No supported authentication methods l>  289   │ 13:30:27.791786 tramp-process-one-action (5) # Looking for regexp "\(^[^#$%> 
 290   │ ]*[#$%>] *\)\'" from remote shell
 291   │ 13:30:27.791810 tramp-process-one-action (5) # Looking for regexp "\(\(?:^\|^M\)[^]  292   │ #-%>]*#?[]#-%>][[:blank:]]*\(?:[[;[:digit:]]*[[:alpha:]][[:blank:]]*\)*\)\'" from remote shell  293   │ 13:30:27.791833 tramp-process-one-action (5) # Looking for regexp "\(Are you sure you want to continue connecting (yes/no\(?:/\[fingerprint]\)?)\?[[:blank:]]*\)\'" from remote shell  294   │ 13:30:27.791856 tramp-process-one-action (5) # Looking for regexp "\(\(?:Store key in cache\? (y/n.*)\|Update cached key\? (y/n, Return cancels connection)\)[[:blank:]]*\)\'" from remote shell  295   │ 13:30:27.791880 tramp-process-one-action (5) # Looking for regexp "\(\(?:TERM = (.*)\|Terminal type\? \[.*]\)[[:blank:]]*\)\'" from remote shell  296   │ 13:30:27.791904 tramp-process-one-action (5) # Looking for regexp "\(Access granted\. Press Return to begin session\. \)\'" from remote shell  297   │ 13:30:27.791927 tramp-process-one-action (5) # Looking for regexp "\(^^M*Confirm user presence for key .*[ 
 298   │ ^M]*\)\'" from remote shell
 299   │ 13:30:27.791949 tramp-process-one-action (5) # Looking for regexp "\(\)\'" from remote shell  300   │ 13:30:27.791971 tramp-process-one-action (5) # Call ‘tramp-action-process-alive’  301   │ 13:30:27.792008 tramp-process-one-action (5) # Looking for regexp "\(.*\(?:login\|user\)\(?:[[:blank:]].*\)?:[[:blank:]]*\)\'" from remote shell  302   │ 13:30:27.792039 tramp-process-one-action (5) # Looking for regexp "\(^.*\(\(?:adgangskode\|contrase\(?:\(?:ny\|ñ\)a\)\|decryption key\|encryption key\|geslo\|h\(?:\(?:asł\|esl\)o\)\|iphasiwedi\|jelszó\|l\(?:ozinka\|ösenord\)\|m\(?:ot de passe\|ật khẩu\)\|p\(?:a\(?:rola\|s\(?:ahitza\|s\(?: phrase\|code\|ord\|p>  303   │ 13:30:27.792074 tramp-process-one-action (5) # Looking for regexp "\(^.*\(?:Permission denied\|Login \(?:[Ii]ncorrect\)\|Connection refused\|Connection closed\|Timeout, server not responding\.\|Sorry, try again\.\|Name or service not known\|Host key verification failed\.\|No supported authentication methods l>  304   │ 13:30:27.792100 tramp-process-one-action (5) # Looking for regexp "\(^[^#$%> 
 305   │ ]*[#$%>] *\)\'" from remote shell
 306   │ 13:30:27.792122 tramp-process-one-action (5) # Looking for regexp "\(\(?:^\|^M\)[^]  307   │ #-%>]*#?[]#-%>][[:blank:]]*\(?:[[;[:digit:]]*[[:alpha:]][[:blank:]]*\)*\)\'" from remote shell  308   │ 13:30:27.792145 tramp-process-one-action (5) # Looking for regexp "\(Are you sure you want to continue connecting (yes/no\(?:/\[fingerprint]\)?)\?[[:blank:]]*\)\'" from remote shell  309   │ 13:30:27.792169 tramp-process-one-action (5) # Looking for regexp "\(\(?:Store key in cache\? (y/n.*)\|Update cached key\? (y/n, Return cancels connection)\)[[:blank:]]*\)\'" from remote shell  310   │ 13:30:27.792193 tramp-process-one-action (5) # Looking for regexp "\(\(?:TERM = (.*)\|Terminal type\? \[.*]\)[[:blank:]]*\)\'" from remote shell  311   │ 13:30:27.792214 tramp-process-one-action (5) # Looking for regexp "\(Access granted\. Press Return to begin session\. \)\'" from remote shell  312   │ 13:30:27.792237 tramp-process-one-action (5) # Looking for regexp "\(^^M*Confirm user presence for key .*[ 
 313   │ ^M]*\)\'" from remote shell
It starts repeating itself freezing emacs until I unplug the smart card two minutes later:
2357243   │ 13:32:28.974595 tramp-process-one-action (5) # Looking for regexp "\(\(?:^\|^M\)[^] 2357244   │ #-%>]*#?[]#-%>][[:blank:]]*\(?:[[;[:digit:]]*[[:alpha:]][[:blank:]]*\)*\)\'" from remote shell 2357245   │ 13:32:28.974625 tramp-process-one-action (5) # Looking for regexp "\(Are you sure you want to continue connecting (yes/no\(?:/\[fingerprint]\)?)\?[[:blank:]]*\)\'" from remote shell 2357246   │ 13:32:28.974653 tramp-process-one-action (5) # Looking for regexp "\(\(?:Store key in cache\? (y/n.*)\|Update cached key\? (y/n, Return cancels connection)\)[[:blank:]]*\)\'" from remote shell 2357247   │ 13:32:28.974681 tramp-process-one-action (5) # Looking for regexp "\(\(?:TERM = (.*)\|Terminal type\? \[.*]\)[[:blank:]]*\)\'" from remote shell 2357248   │ 13:32:28.974709 tramp-process-one-action (5) # Looking for regexp "\(Access granted\. Press Return to begin session\. \)\'" from remote shell 2357249   │ 13:32:28.974736 tramp-process-one-action (5) # Looking for regexp "\(^^M*Confirm user presence for key .*[ 
2357250   │ ^M]*\)\'" from remote shell
2357251   │ 13:32:28.974763 tramp-process-one-action (5) # Looking for regexp "\(\)\'" from remote shell 2357252   │ 13:32:28.974792 tramp-process-one-action (5) # Call ‘tramp-action-process-alive’ 2357253   │ 13:32:28.974834 tramp-process-one-action (5) # Looking for regexp "\(.*\(?:login\|user\)\(?:[[:blank:]].*\)?:[[:blank:]]*\)\'" from remote shell 2357254   │ 13:32:28.974902 tramp-process-one-action (5) # Looking for regexp "\(^.*\(\(?:adgangskode\|contrase\(?:\(?:ny\|ñ\)a\)\|decryption key\|encryption key\|geslo\|h\(?:\(?:asł\|esl\)o\)\|iphasiwedi\|jelszó\|l\(?:ozinka\|ösenord\)\|m\(?:ot de passe\|ật khẩu\)\|p\(?:a\(?:rola\|s\(?:ahitza\|s\(?: phrase\|code\|ord> 2357255   │ 13:32:28.974973 tramp-process-one-action (5) # Looking for regexp "\(^.*\(?:Permission denied\|Login \(?:[Ii]ncorrect\)\|Connection refused\|Connection closed\|Timeout, server not responding\.\|Sorry, try again\.\|Name or service not known\|Host key verification failed\.\|No supported authentication method> 2357256   │ 13:32:28.975006 tramp-process-one-action (5) # Looking for regexp "\(^[^#$%> 
2357257   │ ]*[#$%>] *\)\'" from remote shell
2357258   │ 13:32:28.975033 tramp-process-one-action (5) # Looking for regexp "\(\(?:^\|^M\)[^] 2357259   │ #-%>]*#?[]#-%>][[:blank:]]*\(?:[[;[:digit:]]*[[:alpha:]][[:blank:]]*\)*\)\'" from remote shell 2357260   │ 13:32:28.975060 tramp-process-one-action (5) # Looking for regexp "\(Are you sure you want to continue connecting (yes/no\(?:/\[fingerprint]\)?)\?[[:blank:]]*\)\'" from remote shell 2357261   │ 13:32:28.975089 tramp-process-one-action (5) # Looking for regexp "\(\(?:Store key in cache\? (y/n.*)\|Update cached key\? (y/n, Return cancels connection)\)[[:blank:]]*\)\'" from remote shell 2357262   │ 13:32:28.975116 tramp-process-one-action (5) # Looking for regexp "\(\(?:TERM = (.*)\|Terminal type\? \[.*]\)[[:blank:]]*\)\'" from remote shell 2357263   │ 13:32:28.975143 tramp-process-one-action (5) # Looking for regexp "\(Access granted\. Press Return to begin session\. \)\'" from remote shell 2357264   │ 13:32:28.975170 tramp-process-one-action (5) # Looking for regexp "\(^^M*Confirm user presence for key .*[ 
2357265   │ ^M]*\)\'" from remote shell
2357266   │ 13:32:28.975198 tramp-process-one-action (5) # Looking for regexp "\(\)\'" from remote shell 2357267   │ 13:32:28.975260 tramp-process-one-action (5) # Call ‘tramp-action-process-alive’ 2357268   │ 13:32:28.975383 tramp-process-one-action (5) # Looking for regexp "\(.*\(?:login\|user\)\(?:[[:blank:]].*\)?:[[:blank:]]*\)\'" from remote shell 2357269   │ 13:32:28.975479 tramp-process-one-action (5) # Looking for regexp "\(^.*\(\(?:adgangskode\|contrase\(?:\(?:ny\|ñ\)a\)\|decryption key\|encryption key\|geslo\|h\(?:\(?:asł\|esl\)o\)\|iphasiwedi\|jelszó\|l\(?:ozinka\|ösenord\)\|m\(?:ot de passe\|ật khẩu\)\|p\(?:a\(?:rola\|s\(?:ahitza\|s\(?: phrase\|code\|ord> 2357270   │ 13:32:28.975551 tramp-process-one-action (5) # Looking for regexp "\(^.*\(?:Permission denied\|Login \(?:[Ii]ncorrect\)\|Connection refused\|Connection closed\|Timeout, server not responding\.\|Sorry, try again\.\|Name or service not known\|Host key verification failed\.\|No supported authentication method> 2357271   │ 13:32:28.975613 tramp-process-one-action (5) # Looking for regexp "\(^[^#$%> 
2357272   │ ]*[#$%>] *\)\'" from remote shell
2357273   │ 13:32:28.975677 tramp-process-one-action (5) # Looking for regexp "\(\(?:^\|^M\)[^] 2357274   │ #-%>]*#?[]#-%>][[:blank:]]*\(?:[[;[:digit:]]*[[:alpha:]][[:blank:]]*\)*\)\'" from remote shell 2357275   │ 13:32:28.975729 tramp-process-one-action (5) # Looking for regexp "\(Are you sure you want to continue connecting (yes/no\(?:/\[fingerprint]\)?)\?[[:blank:]]*\)\'" from remote shell 2357276   │ 13:32:28.975776 tramp-process-one-action (5) # Looking for regexp "\(\(?:Store key in cache\? (y/n.*)\|Update cached key\? (y/n, Return cancels connection)\)[[:blank:]]*\)\'" from remote shell 2357277   │ 13:32:28.975887 tramp-process-one-action (5) # Looking for regexp "\(\(?:TERM = (.*)\|Terminal type\? \[.*]\)[[:blank:]]*\)\'" from remote shell 2357278   │ 13:32:28.975943 tramp-process-one-action (5) # Looking for regexp "\(Access granted\. Press Return to begin session\. \)\'" from remote shell 2357279   │ 13:32:28.975974 tramp-process-one-action (5) # Looking for regexp "\(^^M*Confirm user presence for key .*[ 
2357280   │ ^M]*\)\'" from remote shell
2357281   │ 13:32:28.976002 tramp-process-one-action (5) # Looking for regexp "\(\)\'" from remote shell 2357282   │ 13:32:28.976032 tramp-process-one-action (5) # Call ‘tramp-action-process-alive’ 2357283   │ 13:32:28.976107 tramp-process-sentinel (5) # Sentinel called: ‘#<process *tramp/ssh 128.40.123.56*>’ ‘exited abnormally with code 255 
2357284   │ ’
2357285   │ 13:32:28.976193 tramp-process-actions (6) #
2357286   │ user1@128.40.123.56: Permission denied (publickey).
2357287   │ 13:32:28.976298 tramp-process-actions (1) # File error: Tramp failed to connect.  If this happens repeatedly, try 
2357288   │     ‘M-x tramp-cleanup-this-connection’
2357289   │ user1@128.40.123.56: Permission denied (publickey).
2357290   │ 13:32:28.976368 tramp-process-actions (3) # Waiting for prompts from remote shell...failed 2357291   │ 13:32:28.976417 tramp-maybe-open-connection (3) # Opening connection nil for 128.40.123.56 using ssh...failed 


Best,

Daniel

On 08/09/2023 07:50, Michael Albinus wrote:

Daniel Krajnik <krajnik.dan@gmail.com> writes:


Hi

Hi Daniel,


I'm wondering if anyone is able to use Tramp with a gpg smart card or
a gpg agent that manages the ssh socket (so acts as an ssh agent)?

For me it fails with file-error "Tramp failed to connect. If this
happens repeatedly, try\n ‘M-x tramp-cleanup-this-connection’"))"

I tried tramp-cleanup-this-connection, but no, that didn't help.

Tramp seems to work locally - I am able to "sudo-this-file" and enter
pin to unlock sudo (it's managed by the smart card U2F pam module).

Any suggestions how to approach debugging this would be very welcome.

My crystal ball tells me that the gpg smart card communicates with Tramp
with messages Tramp isn't aware of. So we need traces.

Could you please start

--8<---------------cut here---------------start------------->8---
# emacs -Q -l tramp --eval '(setq tramp-verbose 6)'
--8<---------------cut here---------------end--------------->8---

Open the connection. There will be a debug buffer
*debug tramp/ssh 128.40.123.56#48273* which should tell us more.


Best wishes,

Daniel

Best regards, Michael.

Attachment: OpenPGP_0xCFC60FFCAAEC3A7D.asc
Description: OpenPGP public key

Attachment: OpenPGP_signature.asc
Description: OpenPGP digital signature

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