You can try clearing the temp folder.

1) Stop WAS
2) Remove all files from "/opt/IBM/WebSphere/AppServer/profiles/Dmgr/wstemp/"
3) Restart WAS

Found a WAS technote on this:
http://www-01.ibm.com/support/docview.wss?uid=swg21455209

Hello Fazal,

I am assuming you are not able to log into the WebSphere administrative console.  The first thing I would attempt is the following:
1. Stop WebSphere
2. Clear out the following temp directories
<WebSphere_Install_Root>\profiles\(profile_name)\wstemp
<WebSphere_Install_Root>\profiles\(profile_name)\temp
<WebSphere_Install_Root>\profiles\(profile_name)\config\temp
3. Clear out the RTC and WebSphere logs located at
<WebSphere_Install_Root>\profiles\(profile_name)\logs
In this directory there will be two sub directories \ffdc and \(server_name) ... either remove or rename these directories.  During startup WebSphere will recreate.
Also the jts.log, ccm.log ext are located in this directory.  May be a good idea to remove these as well so that we have a clean set of logs when restarting WebSphere
4. Restart WebSphere
5. IF the issue persists, open a PMR against WebSphere and upload the WebSphere logs to the PMR.  This way the WebSPhere admin team can look into this issue.