If you encounter Proxy Authentication Error 2606 in OneDrive, follow the solutions below. The Proxy Authentication error can result from a network glitch. We should ...
After you log in to your Windows computer or execute a command in Command Prompt or Windows Terminal, you may receive a message — Error Writing Proxy Settings ...
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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