The personal certificate called "WebSphere Plugin Key" within the plugin-key.kdb that is shipped with the WebSphere Plugin install will expire on April 26, 2012.
Content
When the plugin is first installed, it places a copy of the plugin-key.kdb file within the [Plugin_Home]/etc directory. When the plugin is configured to an installed web server, it will pull a copy of this file from the [Plugin_Home]/etc location and place it within the [Plugin_Home]/config/{webservername} directory.
This key file contains a personal certificate that is set to expire by April 26, 2012. Action may be required to maintain encryption between the plugin and application server(s). Please read this documentation carefully to determine if you are affected and what steps may be needed to correct this situation.
I'd strongly recommend that you check this Technote, if you use IBM WebSphere Application Server and the WebSphere Plugin.
In our environment, I used the GSK command, as the IKeyMan GUI was not available to me on my headless Linux boxes: -
This gave me my cell-level certificate e.g. CN=Portal, OU=Root Certificate, OU=PortalCell, OU=PortalNode, O=IBM, C=US which I then checked for expiration as follows: -
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