> On Feb 5, 2018, at 12:04 PM, Niclas Rautenhaus 
> <rautenh...@team-datentechnik.de> wrote:
> 
> What I tried so far:

Instead of blindly trying random changes that may only have unwanted
side-effects, collect the information needed to understand the problem.

What you have not yet tried is posting the complete logging for some
of the queue-ids that got "stuck", and (more importantly) posting
"tcpdump" output for a captured session.  If all else fails, then
send a complete PCAP file off-list to Wietse or me.

-- 
        Viktor.

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