Sometimes when you log into SSH, you might notice that some commands or files (such as the error log, or the MySQL command-line client) are inaccessible or don't work correctly. This happens because your SSH account operates in a virtual environment, and this environment can some times be reset (for example, after a server reboot).
This should be automatically repaired shortly after you log in, but if after an hour things still aren't working open a support ticket to the technical support department and we'll be happy to take a look.
