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Bizarro ISP/DNS/mail client stuff
#1
I've got a bizarre thing going on with my Mac and i hope someone here might shine some light...

First things first: iMac 17" G3 with ethernet connection via DLink router, also a 12" Powerbook G4 with Airport Extreme connection to same DLink router. Using Apple Mail client.

I have 4 different email accounts, one with AOL, one with .Mac, one each for two different hosted sites. My main email is via one of those hosted sites. About 3 days ago I stopped being able to connect to that host to receive mail on that account (and that account only, the other 3 work fine), with Mail giving me either of these errors depending on whether I was trying to send or receive mail:

< You can try to send using a different server. All messages will use this server until you quit or change your network settings.>>

or

< The server error encountered was: The attempt to read data from the server “mail.(sitename).com” failed.>>

After getting some ridiculous email replies from the host's tech support I phoned them directly today. The first person I spoke to checked into it and saw that part of my Zone File was missing (something they'd never seen before) and he replaced it, telling me the problem should be fixed within 2 hours.

After 4 hours went by it still didn't work, so I called again. While on hold I tried going to my home page associated with that account. Firefox came back with "Page not found," although I could go to any other site I cared to. I spoke to another rep for the host who had me try some Network Utility items (Ping and Traceroute) and noted that it kept timing out. On his browser he was able to go to my site without a problem, as are other contacts I phoned. So, no mail from this one account and no connectivity to the home page for the same domain. All other mail and all other sites function normally. and I can go to the home page and get email if I poach a signal from a neighbor's wireless connection.

The reps answer was to call my ISP provider (Time Warner) to find out if there is a problem on their side, or more specifically within my building. This didn't make a whole lot of sense to me, but he was out of ammo.

Phoned Time Warner, they checked everything and said all was good. Asked me to wire the cable modem directly to the Powerbook via ethernet, bypassing the router. Voila, I was able to get the email and call up the home page for the site. TW rep said the problem was then obviously the router.

Not so fast, not so obvious. It seems incredibly counter-intuitive that my router would only have a problem with one site, that being my business site, and the associated email. PLUS...the connection only seems to be working on the Powerbook when hard wired via ethernet - when I connect the ethernet directly to the iMac I still can't get the email or the domain page.

Does this make sense to anyone? Any ideas that can be offered before I throw the router and the iMac out the window would be most appreciated.
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#2
I think this is what's happening...

The Zone file is used by DNS servers, and it can take up to 48 hours for changes to DNS info to propagate to DNS servers across the internet. So depending on the DNS server being used a computer might still see the old info, while another might see the new info.

I suspect that you might have setup your D-Link router to use a DNS server other than your TW default (using other DNS servers in routers was a thread topic a few days ago), so when connected to the Cable modem you're using the TW servers and when connected to D-Link you're using a different DNS server.

So either check the D-Link settings or just wait for things to propagate to all of the DNS servers.
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#3
…and I bet that iMac is a G4, not a G3.
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#4
Thanks. Yes, G4, and I knew that but my fingers didn't cooperate.
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