destination unreachable (port unreachable)

[inl2goal <syaoran.sakura@gmail.com>]

Hello:

FreeRadius was working perfectly with EAP/MD5 a few weeks ago here. But some
providers came here to offer a NAC solution and messed with the network
configuration.

Authentication stopped working, and by using a sniffer we realised that
packets get to the freeRADIUS server, to which it responds with a challenge
but apparently that challenge never gets back to the switch and it sends a
"destination unreachable (port unreachable)" message.

Any ideas why that might happen? 

Thanks
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