Active Directory User Login not automatically working for network resources

There is a user on our domain that all of the sudden has to reenter their login information for any network resource. Shared Folders, Exchange, SQL etc. This happens for them on multiple computers. I'm not sure where to even start on this one.
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Hypercat (Deb)Commented:
One of the easiest and quickest things to do might be to simply create a new login ID for that user and see if that fixes the problem. I would create it without an Exchange mailbox first, and see if it works for other network resources (shared folders, printers, etc.).  Then, if that's OK, detach his mailbox from his old ID and attach it to the new one and see if that works OK.
this problem generally occurs because of two possible reasons:
1) Either the user in fact doesn't authenticate to domain
2) The permissions on resources are configured incorrectly (I don't think this is the reason).

There is also one tricky thing that happens sometimes. In Windows you can store some passwords in operating system and ther are being provided anytime needed. If the user changed his password and then this problem started to happen, try this:
1) Click Start -> Run ... type in exactly this command: control userpasswords2
2) It will start one "hidden" control panel. Switch to "Advanced" tab, click "Manage passwords" and if you see any entries here, I think you found the problem. Simply remove the entries, logoff, logon and test if you were successful.
Let us know if this helped.

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snogopherAuthor Commented:
Perfect, I was not aware of that control panel, there were 4 items in the passwords list, i cleared them and everything works fine now.

Glad to hear that, thanks for points:-)
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