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Mac having trouble connecting to IMAP/OWA/POP/OMA -

Hi

I currenly have a Mac user wanting to use OWA from Ireland (as he just moved there) the strange thing is that they could use OWA from home outside of the office on this mac before he moved to Ireland. Now when he logs in, he gets as far as the frames appear and nothing else loads (thats on Safari) if he uses IE on Mac he gets similar results and the error (-3171) and (attempt to load ** failed). I tried turning SSL on and using Forms based authentication. Which also didn't work. So i tried IMAP, and then onto POP3. Again these didn't work. Although the user can telnet ports 25/110/143 etc on the server with no problems from the Mac he still can't use any of the above methods. The IMAP simply downloads the folders from his mail account but nothing else. Pop3 wont even login properly. Although under ESM i can see his session. The ISP tested pop3 from their place in Ireland and they connect with no problems. I can access POP3/IMAP/OWA from anywhere else on a Mac here at our office and at another site.  I've taken off any firewall on the mac and the router.. I think i've tried everything, I can also connect to his machine in Ireland using Apple remote desktop so he can accept connections ok. He also has problems with his iSight not working as it just disconnects (the router disconnects too) but that's another issue, e-mails more important. He's downloaded all the latest updates for his Mac. We've tried Entourage and Mac Mail clients. His router is a Netopia 3330 series, wireless, but he's using ethernet. It's not very good but i've looked at it and it doesn't seem to be blocking anything. Upnp is also enabled. Any help would be greatly appriciated, it seems a very difficult subject.
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IconsultCI
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IconsultCI
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strungCommented:
This may be a long shot, but I wonder if the problem is an MTU problem. Some British ISP's use PPPoA which requires a low MTU, 1458 instead of the standard 1500.

See for instance: http://www.adslnation.com/support/knowledgebase/ht003.php

You might have your user change the MTU to 1458 in the Ethernet section of the Network preferences.
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strungCommented:
Another possibility is that his ISP is blocking ports needed for OWA. He could try going to http://www.grc.com then navigating to the Shields Up section and have GRC run a free port scan on his system.
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IconsultCIAuthor Commented:
He's actually on PPPoE sorry i should of mentioned that before. He's with eircom ISP. I spoke to the ISP and they informed me that they do not block ports or IP addresses, as i asked them. But i'll give the scanner a quick run, thank you :)
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strungCommented:
If he is on PPPoE, his MTU should be set to 1492. He should also set the MTU of the router to 1492 if the router has that capability.
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IconsultCIAuthor Commented:
There's no option to change MTU im afraid. I've actually tested OWA to another site from his Mac and its fine. It's just this one site at the office he can't use OWA/IMAP/POP3/OMA at. They're allowing connections from all IP's though. And he is able to telnet in without problems.
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strungCommented:
Have you tried installing your SSL certificate in Keychain on the user's Mac?

http://www.macosxhints.com/article.php?story=20031023144031331
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