Hi Daniel,

More information. I'm attaching the log (with debug=2) between the dispatcher nodes down & up at the time of the problem.

kamailio_sbc_2.log.txt

Some extra stuff:

1. There is a gap a little bit after the dispatcher sets the nodes down, until a little before the dispatcher sets the nodes up, hope this helps.
2. We use VoIPmonitor and the sensor receives the traffic from a port mirror on the switch, in the timeframe of the issue, there is no traffic detected from the affected server.
3. We pull performance metrics from Kamailio every 10 seconds using xhttp and json-rpc modules, during the issue our tool can't pool metric either:

2017-07-01T22:02:15Z E! Error in plugin [inputs.httpjson]: Get http://127.0.0.1/statistics: net/http: timeout awaiting response headers (Client.Timeout exceeded while awaiting headers)
2017-07-01T22:02:25Z E! Error in plugin [inputs.httpjson]: Get http://127.0.0.1/statistics: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
2017-07-01T22:02:35Z E! Error in plugin [inputs.httpjson]: Get http://127.0.0.1/statistics: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
[...]
[...]
[...]
2017-07-01T22:39:25Z E! Error in plugin [inputs.httpjson]: Get http://127.0.0.1/statistics: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
2017-07-01T22:39:35Z E! Error in plugin [inputs.httpjson]: Get http://127.0.0.1/statistics: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
2017-07-01T22:39:45Z E! Error in plugin [inputs.httpjson]: Get http://127.0.0.1/statistics: net/http: request canceled (Client.Timeout exceeded while awaiting headers)

I will leave the tcpdumps enabled anyway in case next time it happens we can get more or better information.

Joel.

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