What is stopping POP3 access when these laptops connect to the network wirelessly?
I have two laptops that connect to the ISA 2004 protected network by use of an access point or a wireless router. The laptops have the firewall client installed and can access the network, share files, browse the net. Even when the laptops grab an IP off the router (the router is on the protected LAN) they still connect fine. The only issue is that POP3 access in not happening. Thunderbird, Outlook, Outlook Express all fail to send or receive. Plug them in to the network with a CAT5 and the email works with no problems. I am not sure exactly what the issue is and was hoping for someone to shine some light in my direction. The wireless AP and router have been assigned a static IP since before ISA 2004 was ever installed. Email might have worked in the past but now it does not. This problem has just been brought to my attention.
The rules have been set to allow those ports access from the internal network to the external (wan). Email works if it does not cross the AP’s. ISA seems to be treating the AP’s as clients that are not authenticating possibly. But if that was the case then HTTP and HTTPS would not work.
Tagged with: access point • cat5 • email works • lan • Laptops • network share • ports • Router • static ip • thunderbird • wireless ap
Filed under: Laptops
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ISA is a real nightmare. Essentially, if communication is not specifically allowed, it’s automatically denied. I suspect the ports to/from your wireless clients are not specifically allowed, and therefore are blocked. There’s an easy way to test. Find an external e-mail server (an Exchange server is best, but any will do). From a wireless client, open a command prompt and type "telnet xxx.xxx.xxx.xxx 25" where xxx is the IP address of the e-mail server. Follow this with "telnet xxx.xxx.xxx.xxx 110" This telnets on port 25 and port 110, the SMTP and POP3 ports. Since you’re hitting an e-mail server, these ports have to be open on their end. You should get a response. If you don’t, then your firewall is blocking access. Run the same commands on a wired workstation that does function. You’ll get a response.
The fix is impossible here. I’d have to know your configuration, IP scheme, etc. to configure ISA.
Look into the ports. Ports 25 and 26 are used for POP3.