14 Responses to XP and Vista Clients Cannot Sign-In to Lync

  1. Sam says:

    I am having this issue on random computers on our network. After going through this guide I found that those settings were already setup with no minimum any other suggestions? 😦

  2. Kevin Peters says:

    Are those settings set on the server or client side? Also, can you try logging in with an account that is having the issue from a known good machine (like a Win 7 machine).

    Hope this helps!

  3. Deon says:

    Hi, totally off topic here.

    I am busy with a client who is using terminal services for 80% of the users on a Windows Server 2008 R2 server. I have purchased IP phones and will using the phones for voice only and the Lync client will be used for IM and Presence on the TS server. Is there any way that I can stop the Lync client on the TS server from ringin when a call comes in and allow allow the phones to ring.

  4. Deon says:

    OK thanks…

  5. Chris Rhoda says:

    This worked for me with same error using Lync 2010 on a Win08 32 bit server outside my LAN. Thanks!

  6. Nick says:

    Thanks! This saved me hours of troubleshooting.

  7. Shaun says:

    I had the same issue, so I checked the security policies on both the XP client and the Windows 2008 R2 Server. The client had the 128 bit encryption disabled. As I could not change this due to local policy, I just rebooted my client and it started working again. The settings are still incorrect and do not match the server.. So answers on a postcard please. Both machine and server are in different AD domains, does this make a difference ?

  8. Thanks dude. Used your fix this morning … xp clients getting all crazy on me.

  9. Can you verify that this change only had to be made on the Front-End, or both the Front-End and Edge?

  10. Daniel Bergeron says:

    It depends on your deployment,
    In our deployment we have a DIRECTOR pool that takes care of the authentications.
    so this solution had to be done on both of my DIR servers

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