Exchange 2019 outlook autodiscover error (0x80070057)

Question

Hi,

We have 2 exchange server 2019. The url and authentication setting on both servers is the same:

• The autodiscoverserviceinternalurl in client access services
  • https://mail.abc.com/autodiscover/autodiscover.xml
• Different Virtual directory url setting are:
  • internalurl: https://mail.abc.com/xxxx
  • externalurl: https://smtp.abc.com/xxxx
  Everything is fine more than 2 years. One day some internal outlook clients have certificate issue suddenly. So, we use "Test Email Autoconfiguration" by outlook icon to test the connection. We use hostfile to test the connection on 2 servers. If the outlook connects to ServerA, the autodiscover will go to "https://mail.abc.com", and the test successful. Outlook run no error But if the outlook connects to ServerB, the autodiscover will go to "https://mail.abc.com" with error code (0x80070057). Then go to "https://smtp.abc.com". So the outlook will prompt certificate error. The "https://serverB/autodiscover/autodiscover.xml" can access normally in web browser. Any idea?

Answer 1

Hi Chong,
Have you checked whether the certificate on server B is expired or not trusted by the client and may need to be updated or replaced with a new one. OR check the logs on ServerB to see if there are any errors or warnings.
You can also try the following tools to check for issues.
Microsoft Remote Connectivity Analyzer
Kind Regards