The name on the security certificate is invalid or does not match the name of the target site webmail.domain.com. Outlook is unable to connect to the proxy Server ...
Tired of Microsoft Edge "Can't Connect to the Proxy Server" error blocking your browsing? Discover proven, step-by-step fixes ...
Can't you add machine accounts to the autheticated users on the ISA server? Or better yet, use Domain Computers group. That would allow access for all system accounts on all computers.
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