For password cache...
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Network]
"DisablePwdCaching"=hex:01

For refresh...
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"SyncMode5"=dword:00000003
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.