Tip:outlook Unable to update offline address book via CAS server

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