Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Since yesterday I have problems connecting to my server using SSH/SFTP. I can only connect after a restart of my server. When I try to make a connection after a couple of minutes, I can no longer make an SSH connection. I get the error "server unexpectedly closed network connection". SSH connections that are already open stay open. My server has CentOS 6 on it.

Furthermore varnish keeps crashing seemingly randomly, which means my sites get down.

In my SSH error log I get the error:

fatal: setresuid 500: Resource temporarily unavailable
pam_unix(sshd:session): session closed for user

Any ideas what the problem may be? Thanks

share|improve this question
My guess would be that this is a virtual server, and it's running out of memory. Without quite a lot more information, it's hard to tell. – MadHatter May 14 '14 at 9:34
Did you look in any of the server logs? – Jenny D May 14 '14 at 9:43
Not a virtual server. 32Gb of memory and I'm not running out of memory. I am no going to do a complete hardware swap, except for the hard drive. Hope that helps. Server logs weren't very helpful, only thing I could see that varnish was crashing. – user219682 May 14 '14 at 12:20

The documentation of the setresuid system call has this explanation:

       EAGAIN uid  does  not  match  the current UID and this call would bring
              that user ID over its RLIMIT_NPROC resource limit.

In other words you are trying to login as a user, who already has the maximum of allowed processes. Login as another user should still work and allow you to find out what processes are running as the first user.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.