LINUX HACK 14

Hack 14.
Debug SSH Client Session:

 
Sometimes it is necessary to view debug messages to troubleshoot any SSH connection issues. pass -v (lowercase v) option to the ssh as shown below to view the ssh debug messages.
Example without SSH client debug message:
localhost$ ssh -l jsmith remotehost.example.com
warning: Connecting to remotehost.example.com failed: No address associated to the name


Example with SSH client debug message:
locaclhost$ ssh -v -l jsmith remotehost.example.com
debug:
SshConfig/sshconfig.c:2838/ssh2_parse_config_ext:
Metaconfig parsing stopped at line 3.
 
debug:
SshConfig/sshconfig.c:637/ssh_config_set_param_verbose:
Setting variable ‘VerboseMode’ to ‘FALSE’.
 
debug:
SshConfig/sshconfig.c:3130/ssh_config_read_file_ext:
Read 17 params from config file.
 
debug: 
Ssh2/ssh2.c:1707/main: User config file not found, using defaults. (Looked for ‘/home/jsmith/.ssh2/ssh2_config’)
 
debug: 
Connecting to remotehost.example.com, port 22… (SOCKS not used)
warning: Connecting to remotehost.example.com failed: No address associated to the name