Nullmodem server doesn't initialize \ VOGONS

Nullmodem server doesn't initialize

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First post, by wanderyr

Posted on 2020-11-11, 17:59

wanderyr Offline

Rank Newbie

Rank: Newbie
Posts: 5
Joined: 2017-01-18, 06:33

Nothing seems to happen when I enable the nullmodem server in the config file. I'm running an Ubuntu 18.04.5 system with DOSBox v0.74-4.3 (this is the ubuntu package version). I expect to see "Nullmodem server waiting for connection on port 23..." in the console but it never appears. Otherwise DOSBox works just fine.

dosbox-0.74.conf:

1...
2[serial]
3serial1=nullmodem
4...

from console:

1CONFIG: Loading primary settings from config file {correct file path}
2MIXER: Got different values from SDL: freq 44100, blocksize 512
3ALSA: Can't subscribe to MIDI port (65:0) nor (17:0)
4MIDI:Opened device:none
5(nothing else!)

I suspect it may be a permissions problem. Does the linux user need to be a member of any specific group?

I'm not looking for help with the midi issues; I just include them here in case it helps with troubleshooting.
Is there any other information that would help?

Thanks very much for all of your time. DOSBox is great 😀

Reply 1 of 2, by _Rob

Posted on 2020-11-11, 21:17

_Rob Offline

Rank Member

Rank: Member
Posts: 422
Joined: 2019-02-03, 10:46
Location: Europe

The lower 1024 ports are restricted on Unix (and hence Linux) to root. A regular user cannot use them.

For the nullmodem server, specify something like:

1serial1 nullmodem port:5000

For the client, you then specify:

1serial1 nullmodem server:<IP or hostname of server> port:5000

Reply 2 of 2, by wanderyr

Posted on 2020-11-11, 22:21

wanderyr Offline

Rank Newbie

Rank: Newbie
Posts: 5
Joined: 2017-01-18, 06:33

_Rob wrote on 2020-11-11, 21:17:

The lower 1024 ports are restricted on Unix (and hence Linux) to root. A regular user cannot use them.

That was it, Rob! Thank you very much.

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