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Credentials are required, calendar password prompt – Lync/Communicator

If you find users are unable to dismiss credential prompts from communicator or Lync that reference calendar access, even if entering correct password and you are running Checkpoint IPS, it’s likely that the non-compliant http protection is blocking its calendar access through your companies autodiscover.domain.com address. To stop this behaviour, enable an exception for the non-compliant http IPS protection between your reverse proxy’s internal nic and your CAS and your firewall and the published proxy nic/ip.

Should you find you are continued to be prompted for credentials (which are dismissed after you enter them) when connecting from outside the LAN after this change or DO NOT use checkpoint’s IPS, please look at this post – it fixed things for me: http://msexchangeanywhere.wordpress.com/2011/12/29/how-to-fix-lync-services-signin-type-your-user-name-and-password-to-connect-for-retrieving-calendar-data-from-outlook/. Many thanks for this!

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