As i suspected it was a gpo-related issue. In our default domain policy we set: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan\Parameters
Value Name: DisableSavePassword
Value Type: REG_DWORD
Value Data: 1 Changing Value Data to 0 fixed the issue. This stopped windows from remembering the pre-shared key. Regards, Thomas
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