I don’t think the server log is going to tell anything useful. If it’s a nxupnp crash, only a core file with symbols will help. If you get in contact with the support, we’ll provide such binary tomorrow.
In the meanwhile you can just replace the binary with a script doing nothing:
> sudo sh
> /usr/NX/bin/nxserver –shutdown
> cd /usr/NX/bin/
> mv nxupnp nxpupnp.ori
> cat > nxupnp
^D <— press CTRL+D here
> chmod a+x nxupnp
Restart the server:
I tried it and I was still able to connect. UPnP is only used to query and forward ports on the router. You won’t have ports forwarded but, except for that, it should work fine.