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brenteverett

join:2003-04-25
Houston, MO
reply to beharrison

Re: Open RPC port 135 for Outlook to Exchange traffic

said by beharrison:
Exchange clients such as Outlook and Outlook Express use port 135 to connect to Exchange servers. If you have remote users who VPN into your network, this port must be open on the firewall to all them to access the Exchange server. There are numerous Q articles on this topic in the MS Knowledgebase. It is not necessary to open 135 for Outlook Web Access users, as they connect via port 80.
This may depend on how the VPN is set up. If the VPN tunnel can carry any TCP/IP traffic then it is not necessary to open port 135, just the port(s) for your type of VPN (PPTP, L2TP, IPSec).
This is a sub-selection from Open RPC port 135 for Outlook to Exchange traffic