Can't connect to local (within the same lan) server with user different from root

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
ubuntu
Domain
networking

Research direction

Reproduce the reported contrast using the two mosh commands: root succeeds on the local LAN, while the default user reaches SSH but receives no UDP data on port 60002. Start by comparing the server-side behavior and permissions for both users; done means identifying why the non-root connection fails and documenting a verified fix or next diagnostic step.

Written by the indexing model from the issue text.

Description

support

I have an odd issue with a local server running neon (that's ubuntu xenial 16.04). I can connect to it with mosh only as user root, i.e.:

jmarcet@yoga $ mosh root@himawari

works without issue, so there are no firewall issues, yet

jmarcet@yoga $ mosh himawari

mosh did not make a successful connection to 10.7.0.2:60002.
Please verify that UDP port 60002 is not firewalled and can reach the server.
(By default, mosh uses a UDP port between 60000 and 61000. The -p option
selects a specific UDP port number.)
[mosh is exiting.]

In the later case, it starts a ssh connection but it shows a blue line on top saying:

mosh: nothing received from server on UDP port 60002. [To quit: Ctrl-^ .]

and there are no new mosh processes launched either.

I'm out of ideas on how to debug it. Any suggestion?

Dominant language
C++
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