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Port/s used for Proxy requests between ACS SE

I am setting up a new ACS SE and will use this ACS to proxy TACACS requests to another ACS SE in another network tier. I know TACACS uses TCP 49 for authentication. What ports/protocol do the ACS SE use to communicate between one another for the proxy requests? I need to know in order to open the firewall policy to allow access.

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Re: Port/s used for Proxy requests between ACS SE

I think the other commonly used ports are 1645 and 1812. If you select TACACS+ in the AAA Server Type field, this RADIUS Authentication Port field is dimmed.

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