POP3 service not working

pts.
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Exchange 2003
Tech support
Fresh install of Exchange 2003 was performed on Sunday. All worked fine until this morning when the POP3 clients started getting prompted for a password and no credential seems to work. I've checked the event logs and don't see any authentication errors. I rebooted the server without any effect. No change was made to warrant this issue. It's being passed through ISA 2004 and no errors appear there either. Does anyone no what else to check?

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I am going to assume that your Exchange environment consists of a single Exchange server and is also your AD box. Don’t check for strictly logon issues as there could be something wrong with AD and/or your ISA. Personally, I stay away from ISA unless as a last resort. Get a real firewall in there.

I would also double check that the POP3 service has not stopped unexpectedly and is set to automatic start up. Also check to make sure individual accounts still have permissions for POP3.

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