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When I type the following command on my Ubuntu 16.04: sudo freeradius -X I've got the message:

Failed binding to authentication address * port 1812 as server eduroam: Address already in use

I've read previous topics related to that issue and their problem were that freeradius service had been running already. But in my case it's true. Here is output of the command: sudo ps aux | grep freeradius:

tnur      1349  0.0  0.0  12948   932 pts/0    S+   09:44   0:00 grep --color=auto freeradius

There is no running freeradius service! What could be the problem in my case?

garethTheRed
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tnur
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2 Answers2

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You've probably got two listen sections bound to the same port. Remove all symlinks from freeradius/sites-enabled and add them back one by one until you find the conflicting listener.

My guess is you changed the inner-tunnel virtual server to listen on port 1812. Don't do that, the listener in this virtual server is only so you can send test packets. In normal operations requests are proxied to that virtual internally.

Arran Cudbard-Bell
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As per Arrans answer, however for those looking at the same issue: extend garethTheReds comment and try the following as well (to catch any services running on UDP rather than TCP port):

sudo lsof -i udp:1812

Alistair Crust
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  • As it’s currently written, your answer is unclear. Please [edit] to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Mar 28 '23 at 14:38