Error ID 28042 and UCMA sign-in fails in Skype for Business Server 2015

Symptoms

In a Microsoft Skype for Business Server 2015 environment, users can’t sign in to the Skype for Business on Mac or Skype for Business for iOS client. In addition, the following error message is logged:

HttpHeader:X-Ms-diagnostics 28042;source="ServerName.domain.com";reason="Too many outstanding requests for a single user."

Resolution

To fix this issue, install the following updates:

Workaround

To work around this issue, restart the UCWA application pool on the affected server or restart the affected server. But this issue will occur in one or two months.

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