Error "udp output 192.168.[...] sendto failed with error 64"

[benkuper]

Hello,
unfortunately i can't say much about the context because i'm trying to help a remote user that get this error once in a while on specific messages.
Thoses messages don't have arguments, and apparently the error appears approximately one out of 3 times, not in a regular way.
Some other messages seem to never rise this error.
I looked up the code, and general udp error but couldn't find anything about error 64..
Any idea ?

Thanks