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When a virtual server without a connectivity profile is accessed with the request for a file pre/config.php, an invalid file is cached in the BIG-IP system's HTTP cache. When the same request is later sent to a virtual server that does contain a connectivity profile, the invalid file from the cache is returned, which results in VPN connection failure.
End-user may not be able to use the VPN.
-- APM is configured. -- Virtual server without connectivity profile is configured. -- Another Virtual server with connectivity profile is configured. -- The first virtual server is accessed with an HTTP request for pre/config.php?version=2.0. -- Then second virtual server is accessed with same request.
When the issue occurs, run the following command on the BIG-IP command line in order to clear the cache: tmsh delete ltm profile ramcache all
The caching functionality has been updated to ignore the caching of invalid files.
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