Hello David,

Am 27.09.2016 um 19:47 schrieb David S:

i setup a new tor exit server and am seeing this in the log messages:

18:25:01 [WARN] Failing because we have 1352 connections already. Please read doc/TUNING for guidance. [11430 similar message(s) suppressed in last 21600 seconds]

any ideas why?

this is happening on a shared VPS, running ubuntu 16.04 and tor v0.2.8.8. i'm starting to think it's some limitation by the VPS provider.

uname -a shows a old kernel (possibly centos 6):

Linux km14133-25 2.6.32-042stab113.21 #1 SMP Wed Mar 23 11:05:25 MSK 2016 x86_64 x86_64 x86_64 GNU/Linux

This kernel usually indeed runs on a system based on CentOS 6, the kernel version points to a Virutozzo/OpenVZ kernel, possibly the distribution is the "VzLinux" provided by Virtuozzo which is derived from CentOS 6.

i'm starting to scratch my head. maybe i should do some intense debugging on this box..

If your system indeed runs in a Virtuozzo/OpenVZ container, the container itself has limits imposed by the VPS provider that differ from the ones you would expect from a regular Linux system. The relevant parameters are available to you in /proc/user_beancounters. Just look there and especially check if any of them are maxed out or have previous failures. Especially parameters like "tcpsndbuf", "tcprcvbuf" or "numothersock" could be relevant to your use case.

A good point to start understanding these parameters would be the following KB article:

https://kb.plesk.com/en/1354

Of course the error message could also be caused by something else but since your VPS seems to be Virtuozzo based, the beancounters would be the first thing I would check.

Helmut