Outlook keep prompting logon credentials then goes offline
Microsoft Outlook use Windows Logon credentials to authenticate against domain to access Exchange server. If it keeps popping up to you for logon credentials, then potentially something may not happening between you workstation and the domain controller (DC). Here is what you should check:
- Cabling - Physical Network connectivity
- Communication - Try PING DC from workstation and vice versa using full qualified domain name (FQDN). i.e. dc.domain.local
- New Outlook Profile - Try creating new Outlook Profile and point the Exchange server to Global Catalogue (GC) server
- If it still doesn’t work, check workstation event viewer and look for:
Event Type: Error
Event Source: Kerberos
Event Category: None
Event ID: 4
Date: 10/1/2008
Time: 12:41:09 PM
User: N/A
Computer: Workstation Name
Description:
The kerberos client received a KRB_AP_ERR_MODIFIED error from the server host/dc.domain.local. This indicates that the password used to encrypt the kerberos service ticket is different than that on the target server. Commonly, this is due to identically named machine accounts in the target realm (Domain.Local), and the client realm. Please contact your system administrator.
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
If you see this, then most likely it means DC does not accept the password your workstation use for encryption. This event will appear whenever application such as Outlook trying to authenticate against DC.
To resolve this you can try the following command line on DC:
netdom reset name_of_machine /server:name_of_DC /domain:name_of_domain
Note: You must have support tools installed on DC that you execute this command. Use FQDN.
If this doesn’t work, then you have to
1. Delete or reset the computer account and wait for replication to happen to all DCs.
1. disjoin and rejoin computer back to domain and remember to perform ipconfig/flushdns
That will most likely solve your issue.
