OddATC client tries to connect then disconnects repeatedly

[vincento]

At my site, the OddATC client will not remain connected to the network for more than a few seconds. It disconnects and retries repeatedly. The same machine and client connect perfectly well elsewhere on other networks.  This sounds like it is a router issue with the router blocking some port or other.  Does anyone know what port or ports are required for the client to function properly?

Thanks for your help!

[KB4TEZ]

it's either a port number is not in the list as active, or it's a firewall issue blocking that port data.