On a test / dev platform we used platform816_upgrade_solaris32.bin as provided by BEA to perform an upgrade from weblogic 8.1 sp3 to 8.1 sp6. The upgrade was successful. On an identical server (production)we attempted to follow the same steps with the same upgrade executable and it failed. Very early in the upgrade the tool requested that we identify BEA_Home which we did. It then replied that weblogic 8.1 was not running on our production server. Therefore we were unable to complete the upgrade. We do, however, run weblogic 8.1 on that server ... without question. We have a valid license file and we can view weblogic version info in our weblogic console. We noticed that the registry.xml file on the test server is different from the registry.xml file on production. Can anyone provide any assistance or advice? Thanks!