Exchange 2007 OWA timeouts in the registry

The trusted-client timeout is stored as a DWORD, calibrated in minutes, at:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchange
WEB\OWA\TrustedClientTimeout

For public clients, it’s a different value in the same branch:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchange
WEB\OWA\PublicClientTimeout
(also a DWORD calibrated in minutes)
The default timeout for trusted clients is 24 hours; the default timeout for public clients is 15 minutes. The PublicClientTimeout value can never be larger than the TrustedClientTimeout value.
If your company policy is exceptionally strict, you can set the public client timeout to a mere five minutes. If you’re confident that only properly authenticated users will be accessing your intranet desktops, you can set the value for trusted clients as high as 43200, or 30 days.

Be all the Uber Geek and do it from Exchange Powershell


set-ItemProperty ‘HKLM:\SYSTEM\CurrentControlSet\Services\MSExchange OWA’ -name TrustedClientTimeout -value 1440 -type dword
set-ItemProperty ‘HKLM:\SYSTEM\CurrentControlSet\Services\MSExchange OWA’ -name PublicClientTimeout -value 1440 -type dword

then perform an iisreset /noforce command on the cmd prompt

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About Mike

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