What do error codes mean, e.g. errno=11

[1260900]

recv on socket 14 returns -1 (errno=11)
socket 14: 1 ( IPOLLING_READ )
recv on socket 14 returns 20 (errno=0)

[jselbie]

Can you share your command line and operating system?

I'm 90% certain this is expected and normal for TCP mode. errno 11 is legacy EAGAIN, which means the socket didn't have any more immediate data on it. This is a benign error - really just a verbose info message. Not an actual error.

[1260900]

"In my logs, I see the message 'sendto returns 68 (err==22)'. What does this mean? Is this an error, and how can I troubleshoot it?"

[jselbie]

More details needed.

Can you share your command line for starting the server?
Operating system distro details?
DM or email me if you don't want to share your IP/DNS info in public.

I think this is benign. If sendto returns 68, that means it sent the message. The err=22 thing might just because the last errno is not getting reset.

Do see that err = 22 message for ALL request/responses? Or just a few certain ones?