when S4B Client signing-in "There was a problem verifying the certificate from the server"

Alper Günay 41 Reputation points
2025-01-20T20:47:10.19+00:00

Hello everyone;

Domain name and sip domain has changed from olddomain.com to newdomain.com because of company name changing. Exchange side is ok. no problem for accessing mailboxes. But We have an issue. client is getting error when client is signing into S4B client, "There was a problem verifying the certificate from the server".

Onprem S4B Server Standart edition installed and running state, I have one FE server. We changed DNS names for new sip domain. We created new certificate for new domain from local CA and imported to FE server.

We added new sip domain under S4B FE server.

I am missing something. I couldnt figure it out. thank you for assistance and effort.

Skype for Business
Skype for Business
A Microsoft communications service that provides communications capabilities across presence, instant messaging, audio/video calling, and an online meeting experience that includes audio, video, and web conferencing.
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Accepted answer
  1. JimmyYang-MSFT 56,646 Reputation points Microsoft Vendor
    2025-01-24T09:45:22.1033333+00:00

    Hi @Alper Günay

    Thanks for your feedback above which shared more information and glad to know that your issue is resolved now! Since our forum has the policy that The question author cannot accept their own answer. They can only accept answers by others, and according to the scenario introduced here: Answering your own questions on Microsoft Q&A

    I would make a brief summary of this post so that other forum members could easily find useful information here:

    [S4B Client signing-in "There was a problem verifying the certificate from the server" - Summary]

    Issue Symptom: Domain name and sip domain has changed from olddomain.com to newdomain.com because of company name changing. Exchange side is ok. no problem for accessing mailboxes. But We have an issue. client is getting error when client is signing into S4B client, "There was a problem verifying the certificate from the server".

    Solution: Oauth certificate was expired on Front end server.We renewed oauth certificate and published topology. After that, client was able to sign-in Skype for Business

    You could "Accept Answer" for this summary to close this thread, and your action would be helpful to other users who encounter the same issue and read this thread. Thanks for your understanding!


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