Re: generating ECONNRESET with no syscall?

["J. Lewis Muir" <jlmuir%imca-cat.org@localhost>]

On 4/20/16 7:52 AM, Edgar Fuß wrote:
> Is it, for a user process, legally possible to put one of its socket
> into a state where trying to connect to it returns ECONNRESET without
> the process issuing any syscalls during the connection attempt?
>
> We have two production web servers, both running lighttpd, the first
> still running on NetBSD 4.0.1, the second on 6.1. Occasioally, on the
> second, you get Connection Reset by Peer (NOT Connection Refused)
> on the HTTP port. ktrace-ng the lighttpd process reveals close to
> no activity. Restarting lighttpd instantly resolves the problem. Is
> there any way the lighttpd process may have put its socket into this
> condition or must this be a kernel issue?

Hi, Edgar.

What version of lighttpd is it?  Is there a firewall on the server or
elsewhere that could be unexpectedly sending the TCP reset?  Is CGI or
similar involved, or does it happen even when serving static content?

Regards,

Lewis