Ports to open on ISA server when installing Domino

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I’m trying to install Domino server on a Microsoft ISA server and although I can access the server on the internet from a browser, I can’t access it vie the internet using a Notes client (unless I’m on the same LAN). Is there a port that I need to expose on the ISA server?

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Subject: Ports to open on ISA server when installing Domino

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Subject: RE: Ports to open on ISA server when installing Domino

Thanks