Error when sending mail from 1C "Unable to create selectable TCP socket (1489 >= 1024)"?

Question

linux

Client server option. Version 8.3.7.2008. Linux server (Ubuntu 14.04).
Error "{ GeneralModule.WorkingWithMailMessagesService.Module (341)}: Error calling context method (Connect): Unable to create selectable TCP socket (1489 >= 1024)"
while receiving mail transmission channel closed .
If you restart the 1C server service, then everything works fine, for 8 hours, then again problems with sockets.
Additional information about the server:
ulimit -n (handle limit per process)
16384
lsof | grep usr1cv8 | wc -l (number of network connections)
624
Additional error information:
- occurs for some users, others at this moment work with mail normally
- sometimes the error disappears for some users and goes to others

Answer 1

It is necessary to increase FD_SETSIZE. The system returns more than your software can use.