have a look at Microsoft.com/kb & search for: Microsoft Knowledge Base Article - 270836 - you can test this on one client and see if the performance gets better.
It might be a port issue depending on how the Exchange server communicates eg Server-client & Client-server and how the firewall is set up. Probably it does not allow the server to start a tcp/udp session from it's side to the client if the client not already has a session open. [do think this applies to resources problem too] Another thing: Is the Firewall using NAT/PAT? [Ipsec] -----Original Message----- From: Rutherford, Robert [mailto:[EMAIL PROTECTED] Sent: 24 March 2004 08:41 To: [EMAIL PROTECTED] Subject: RE: [ActiveDir] Exchange 2003 and Firewalls It wont be a port issue as you wouldn't gain connectivity at all... If it is a very old firewall then chances are that it may be causing issues.... Will they drop it for a testing period to see if it makes a difference? If it is for their benefit, i.e. their clients then they may? At least that way you could say it's their firewall and they need to update it to gain performance? -----Original Message----- From: Salandra, Justin A. [mailto:[EMAIL PROTECTED] Sent: 23 March 2004 19:01 To: [EMAIL PROTECTED] Subject: RE: [ActiveDir] Exchange 2003 and Firewalls No it is a private T1, point to point. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rutherford, Robert Sent: Tuesday, March 23, 2004 1:26 PM To: [EMAIL PROTECTED] Subject: RE: [ActiveDir] Exchange 2003 and Firewalls I take it this is a public T1 over the internet, comms via a VPN? -----Original Message----- From: Salandra, Justin A. [mailto:[EMAIL PROTECTED] Sent: 23 March 2004 17:35 To: [EMAIL PROTECTED] Subject: RE: [ActiveDir] Exchange 2003 and Firewalls Physically the two orgs are connected by a T1 Line. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rutherford, Robert Sent: Tuesday, March 23, 2004 11:16 AM To: [EMAIL PROTECTED] Subject: RE: [ActiveDir] Exchange 2003 and Firewalls Is this on the same physical site? -----Original Message----- From: Salandra, Justin A. [mailto:[EMAIL PROTECTED] Sent: 23 March 2004 14:58 To: ActiveDir (E-mail) Subject: [ActiveDir] Exchange 2003 and Firewalls I have a facilities that insists on having a very old 3Com Firewall between our organizations. On his side of the firewall is has 400 + outlook clients, on my side I have the Exchange 2003 server and the Global Catalog Servers. Clients are taking an extremely long time to connect to mail and access resources. None of my other 9 facilities have this problems and the only thing different is that none of the others have a firewall between our two organizations. What ports do they have to open to allow proper communications between their clients and my servers? Justin A. 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