Re: Any acceptance of TCP connections suddenly BREAKS without provocation globally: gives 'connection reset by peer', 'connection refused' or blocks. Only solved by reboot. Details&analysis provided. Request for pointers as to nail down the error source.

[Mikael]

2013/11/21 Kārlis Miķelsons <karlis.mikels...@lf.lv>

> Hello,
>
> ..


> As for my "solution" to this issue - there were multiple websites on
> server that were generating random URLs every time the page was visited,
> something like this:
> http://domain.lv/index.php?2fse%3Djl6Vs1FqHZ6zgZzcUWH+
> 1O6V5iO6zHf%3DjzfSUnVBn6
> http://domain.lv/index.php?5fZ9%3D5fBnV%3DfZ80iwg9CicpBH2fse%3DW2c88
>
> Needless to say, web crawlers were scanning these webpages 24/7 and
> creating quite heavy load for the webserver. As soon as we added robots.txt
> for these specific webpages and later redesigned them with static URLs,
> issue went away. Something seems to trigger this bug on OpenBSD, and exact
> same server configuration was working just fine up until upgrade to OpenBSD
> 5.2.
>
> In my case webpages were served by OpenBSD Apache + PHP 5.3.21 (with curl,
> gd, imap, mcryp, mysql, mysqli and pdo_mysql extensions installed from
> packages).
>
>
> --
> Karlis
>

Do you have any approximate idea of how many simultaneously open incoming
and outgoing TCP connections your machine may have had at peak?