Ok, that’s a good start.
If you resize the log output of the Dedicated Server Launcher so you can see the log very well, if you try to connect to the server, do you see anything happening on the server at all? Can you see the logging happening, and do you see any error reported by the server (mod errors, time out message, network problem, etc…).
Is it a VM on your own network, or in some hosting center somewhere else?
If it’s somewhere else, from your client machine, can you try to check the network stability by running a continuous ping for a few minutes, example:
> ping /t you.server.ip.here
Pinging 195.110.28.64 with 32 bytes of data:
Reply from 195.110.28.64: bytes=32 time=1ms TTL=127
Reply from 195.110.28.64: bytes=32 time=1ms TTL=127
Reply from 195.110.28.64: bytes=32 time=1ms TTL=127
(...)
Reply from 195.110.28.64: bytes=32 time=1ms TTL=127
Reply from 195.110.28.64: bytes=32 time=1ms TTL=127
Reply from 195.110.28.64: byt...
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