Lync 2010 Credentials are required

Posted on 2012-09-19
Last Modified: 2012-09-23
I have successfully deployed a Lync 2010 topology and can sign in successfully via the client, but after a few seconds I am prompted with a popup:
Credentials are required
Type your user name and password to connect to the certificate service

Some users get this messages, another not, what can I do it?
Question by:Istvan Kalmar
    LVL 35

    Accepted Solution

    1.) First at all, make sure your Lync is up to date (including the client)

    2.) Here is a tool to test lync connectivity

    3.) You can CRTL-rihgt mouse on the Lync client tray icon to see connection information

    4.) Check how users log in, the Sip Account is like an email address, but user name can be a kerperbos (like email) or NeBios Domain\username format.

    5.) There may be a tracing log file in C;\users\%username%\tracing
    LVL 34

    Author Comment

    by:Istvan Kalmar

    It seems there is a problem with clients that non member of the domain, I think I need some certification from DC.
    LVL 35

    Assisted Solution

    OK, check if the clients can resolve the certificate, what is installed on the LYNC. The client should have the Root certificate in the local cert store to validate the cert.

    If dialin is configured, you can test it by https://dialin.yoursipdomain.tld. The browser should not throw a cert error (assumed dialin works from internal clients and was added to the Lync cert).

    Featured Post

    Do You Know the 4 Main Threat Actor Types?

    Do you know the main threat actor types? Most attackers fall into one of four categories, each with their own favored tactics, techniques, and procedures.

    Join & Write a Comment

    Yahoo Messenger is one of web's most popular free IM (Instant Messenger) services. Yahoo messenger is very popular with teens who like to use it everyday to be in contact with their friends and family members. It has become a part of the daily life …
    I have put this article together as i needed to get all the information that might be available already into one general document that could be referenced once without searching the Internet for the different pieces. I have had a few issues where…
    The goal of the tutorial is to teach the user how to instant message and make a video call in Skype.
    Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

    746 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    16 Experts available now in Live!

    Get 1:1 Help Now