User accounts with a jailshell enabled seem to get this error sometimes, (when trying to run commands in console).
-jailshell: fork: Resource temporarily unavailable
I believe this is a bug in cPanel's jailshell implementation. It may let the user use some commands, but usually any command (ls, cat, etc...) returns this error. This can be corrected easily:
- Log in to WHM
- Suspend the account experiencing the issue
- Unsuspend the account
This seems to reset the jailshell for the account and removes the error.