Failure phenomena
The Hosts file points to the CAS server, download the communication card in the progress interface, no response, nor error.
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Fault analysis
By running the client Autodiscover Autodiscover, you can find the virtual directory address of the OAB https://mail.contoso.cn/OAB/627acf4f-05f5-4f31-b73f-22ffaccdcfa4, Try to access the address in IE
If you access the OAB address of the failed CAS server HTTPS://10.1.1.1/OAB/627ACF4F-05F5-4F31-B73F-22FFACCDCFA4, it is normal to open the authentication window
If the address of the OAB that accesses the unhealthy CAS server is HTTPS://10.1.1.2/OAB/627ACF4F-05F5-4F31-B73F-22FFACCDCFA4, the error page of OAB internal error is returned. ,。
Then come to the CAS server, open IIS, switch to the OAB node, access port 443, get the following error:
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As can be seen from the error, there is no permission to read the Web. config profile
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Fault resolution
On the CAS server, locate the OAB folder, locate the Web. config file, and add the authentication users "read" and "Read and execute" permissions to the file.
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Tip:outlook Unable to update offline address book via CAS server