leedesmond’s blog

You sign-in to Lync 2010 successfully and receive another “Lync - Services Sign In” prompt a short while later (multiple password prompts in succession). The account field is already populated with your SIP sign-in address and is not changeable. Modifications are possible only on the user name and password fields.

If you specify incorrect information in any of the fields or click Cancel, you will find that Lync 2010 will be “plastered” all over with the infamous red bang exclamation error alert, including the Lync icon on the Windows system tray.

Clicking on the notification message, you will be confronted with the message(s) indicating Lync 2010 integration errors with Exchange / Outlook:
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Lync
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Lync cannot connect to the Exchange server. Lync will attempt to retry the connection. History, voice mail and Outlook-related features will be unavailable.
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OK
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-or-

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Lync
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Lync is experiencing connection issues with the Exchange server. Lync will attempt to repair the connection until it is fully restored. History, voice mail, and Outlook-related features might be unavailable or out of date until the connection is restored.
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OK
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Besides the features that will not be available (per message), users will not be able to search for corporate contacts even if they exist in reality (”The address book is preparing to synchronize. Search results may not be current.” or “No results found”).

Possible cause(s and fixes)

1. ensure that all the sign-in information are correctly entered.
2. check that Lync Configuration entry does not read “MAPI Information;Your Outlook profile is not configured correctly. Contact your support team with this information.;MAPI unavailable;”
3. verify that Outlook profile E-mail address of the locally logon user matches that of the SIP sign-in address.
4. the red exclamation mark should go away and all contacts (corporate, federated or PIC) are searchable again if at least the Lync Configuration Information entry does read “EWS Information;–;EWS Status OK;” (even if MAPI shows as unavailable but Outlook 2007/2010 must still be installed locally).
5. confirm that the external URL is properly (server) published on the reverse proxy and defined in Topology Builder
6. if Kerberos authentication is enabled*, check for significant time skew or major time difference on the latter vs. the forest/domain’s time keeper.

* Lync Server Control Panel / Security / Registrar

References
- Microsoft Lync 2010 continuously asks for credentials after signing in (KB2298541)
- How to troubleshoot Exchange connection errors and Outlook integration errors in Lync Online (KB2436962)
- How to troubleshoot sign-in issues in Lync Online (KB2541980)

Technorati tags: Microsoft Lync Server/Client 2010

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