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When i’m login into my server using putty it log in perfectly but when i try to use : su it asks for password. But after a while without login as super user it shows
can not fork user shell: Cannot allocate memory
How to overcome this situation ?
If your user has processes, kill them. If you can ssh as root (khm..) try that.
Do some investigation to know why does this happened (top/mem/…). Of course you need memory for this so best wishes…
If these fail you have to use the good old ctrl+alt+reset combination 🙂