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The server is returning 500 error. And in the logs I see many records like (105: No buffer space available) while connecting to upstream

Tried to restart server : didn't help. Increased the number of sockets : didn't help.

VPS, running Ubuntu 16.04 LTS 64bit (with VestaCP if it is important) apache2 Nginx.

Memory: 

              total        used        free      shared  buff/cache   available
Mem:           8192        1688        5237         330        1266        6277
Swap:             0           0           0
Total:         8192        1688        5237

Disk space is also sufficient:

Filesystem        1K-blocks      Used Available Use% Mounted on
/dev/ploop35701p1 423434036 228973348 173279660  57% /
devtmpfs            4194304         0   4194304   0% /dev
tmpfs               4194304         0   4194304   0% /dev/shm
tmpfs               4194304      8412   4185892   1% /run
tmpfs                  5120         0      5120   0% /run/lock
tmpfs               4194304         0   4194304   0% /sys/fs/cgroup
none                4194304         0   4194304   0% /run/shm

inodes:

Filesystem          Inodes  IUsed    IFree IUse% Mounted on
/dev/ploop35701p1 52953088 933621 52019467    2% /

What can I do (desperated)?

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  • 1
    did you trie to check the number of inodes using df -i ?
    – c4f4t0r
    Sep 15, 2019 at 17:55
  • Filesystem Inodes IUsed IFree I Use% /dev/ploop35701p1 52953088 933621 52019467 2% / so also low usage
    – Alexander P
    Sep 15, 2019 at 18:03
  • Please show the content of /proc/user_beancounters.
    – Michael Hampton
    Sep 15, 2019 at 19:02
  • i thought any question which has an control panels are out of scope?
    – djdomi
    Sep 15, 2019 at 19:51
  • Try to use the strace -p <pid-of-daemon> to trace the issue.
    – Anton Danilov
    Sep 15, 2019 at 21:00

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