[Lazarus1331]

"Connection to failed"

This message is from executing the command:
smbclient ///var/run/cups/cups.sock/print$

It is telling you that it failed to connect to your Samba server.

Use the -H <Your_Samba> option to specify the server. I was getting this error because for some reason it was not by default connecting to the right place.

Also, make sure you are providing a username and password which matches an account in smbpasswd.