Port Blockage

Due to the recent Windows RPC Vulnerability, ports UDP 135 and TCP 135, 137, 139, 445, 593, and 4444 were blocked. This is beyond our control. We are using Exchange 5.5 and prior to the blockage a user could logon to their laptop at home or in a hotel as if they were on the office network – connect to their internet provider – open the outlook set up on their laptop and access their email account just like they do in the office. This gives them more flexibility with their email account then accessing it through OWA. Since the ports were blocked they receive the following message when they open outlook “Your Microscoft Exchange Server is Unavailable”. They can still access their account through OWA. I believe the problem lies with port 135 but am unsure how to fix it.