Nat Network - no internet connection after 3-21 days

[box-tester]

Hello!

I have 3 VMS in NatNetwork: Debian, Windows 2016 AD and Windows 2016 with Exchange 2016. Host OS: Ubuntu 18.04 i have no internet connection after some days and need to restart virtualbox service. i tried different kernels - no effect. Virtualbox versions: 5.2.8 - 7 days w|o restart 5.2.10 - 21 days w|o restart 5.2.12 - 7 days w|o restart 5.2.14 - 3 days w|o restart 5.2.16 - 1 day w|o restart

I have another natnetwork w/o Exchange and same config and it's worked! What kind of log i need to upload?

[Valery Ushakov]

Sounds like a duplicate of #17352

[box-tester]

Yes, very similar. Do you need traffic log? I have Zabbix and Grafana. Grafical metrics shows me, that data traffic on zabbix is not goes for 3-4 times (3-4 minutes everyone) before Internet connect is lost. Some kind of buffer overflow?

[janitor]

There's a nat network log file in ~/.config/VirtualBox/${NetworkName}.log (or ~/.VirtualBox/...), but it usually doesn't have anything interesting. We can make a special test build with quite a bit of extra logging enabled, but a day or two of verbose logging will be a lot. Can you try to narrow down what seems to trigger it, so that verbose logging can be used in a more focused scenario?

[box-tester]

It is Post-server(Exchange), i do not see what's traffic goes. Letters. I have a lot of space 1-2Tb. Please, make this test build and i can take a log file, then delete garbage by hand.

[box-tester]

#14748, #13794, #17416 - not the same bug?

[box-tester]

test: restarted service virtualbox without restarting VMs. And it's worked! Do not need to restart VMs when Nat network lost internet connection.

[Valery Ushakov]

Yes, #14748 is probably the same problem too. I will close this one and #17352 as duplicates. I think you will need to leave a comment there to get Cc'ed on the mails, it doesn't happen automatically.