Following the disconnect, the minion tries over and over and over
again to establish a new connection, which gets shut down by the
remote:

  2.216183  10.178.17.2 -> 77.109.139.93 TCP 76 42836 > 4505 [SYN] Seq=0 
Win=14600 Len=0 MSS=1460 SACK_PERM=1 TSval=294780260 TSecr=0 WS=16
  2.244185 77.109.139.93 -> 10.178.17.2  TCP 76 4505 > 42836 [SYN, ACK] Seq=0 
Ack=1 Win=14480 Len=0 MSS=1452 SACK_PERM=1 TSval=250894922 TSecr=294780260 WS=16
  2.244185  10.178.17.2 -> 77.109.139.93 TCP 68 42836 > 4505 [ACK] Seq=1 Ack=1 
Win=14608 Len=0 TSval=294780267 TSecr=250894922
  2.244185  10.178.17.2 -> 77.109.139.93 TCP 93 42836 > 4505 [PSH, ACK] Seq=1 
Ack=1 Win=14608 Len=25 TSval=294780267 TSecr=250894922
  2.272187 77.109.139.93 -> 10.178.17.2  TCP 68 4505 > 42836 [ACK] Seq=1 Ack=26 
Win=14480 Len=0 TSval=250894929 TSecr=294780267
  2.272187 77.109.139.93 -> 10.178.17.2  TCP 68 4505 > 42836 [FIN, ACK] Seq=1 
Ack=26 Win=14480 Len=0 TSval=250894929 TSecr=294780267
  2.272187  10.178.17.2 -> 77.109.139.93 TCP 68 42836 > 4505 [FIN, ACK] Seq=26 
Ack=2 Win=14608 Len=0 TSval=294780274 TSecr=250894929
  2.300190 77.109.139.93 -> 10.178.17.2  TCP 68 4505 > 42836 [ACK] Seq=2 Ack=27 
Win=14480 Len=0 TSval=250894936 TSecr=294780274
[and the next port:]
  2.404198  10.178.17.2 -> 77.109.139.93 TCP 76 42837 > 4505 [SYN] Seq=0 
Win=14600 Len=0 MSS=1460 SACK_PERM=1 TSval=294780307 TSecr=0 WS=16
  […]

On the master side, this corresponds to several hundred of lingering
connections, according to netstat:

  tcp        0      0 77.109.139.93:4505      82.135.64.143:42250     TIME_WAIT 
  -

# netstat -natp | grep -c :4505.*TIME_WAIT
484

I am running both minion and master with --log-level=trace, but
there is nothing in the output about this.

-- 
 .''`.   martin f. krafft <madduck@d.o>      Related projects:
: :'  :  proud Debian developer               http://debiansystem.info
`. `'`   http://people.debian.org/~madduck    http://vcs-pkg.org
  `-  Debian - when you have better things to do than fixing systems

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