As a reference-
As per Christian-
I did a fresh installation of OBIEE 126.96.36.199 on a Windows Server 2008 R2 Standard 64 bit (I installed the 64bit version) and patched it to 188.8.131.52.2. When trying to upgrade the .rpd file from 10.3.4.1 the Upgrade Assistant simply hangs when clicking on the "next" button after supplying the relevant informations. Setting the ORACLE_HOME environment variable as mentioned in the thread above didn't solve the problem. Also I don't have another oracle home on that machine, so I think I started the correct UA.
When looking at the logfile of UA i get those messages:
[2012-06-11T10:36:58.033+02:00] [Framework] [NOTIFICATION]  [upgrade.Framework] [tid: 11] [ecid: 0000JVQg5GmBt1YzLofP8A1FpQrf000002,0] Please enter the repository password:
[2012-06-11T10:36:58.051+02:00] [Framework] [NOTIFICATION]  [upgrade.Framework] [tid: 11] [ecid: 0000JVQg5GmBt1YzLofP8A1FpQrf000002,0] Please enter the 10g Admin password:
I get those log file entries immediately after I press the "next" button. Needless to say I entered the correct admin password and a valid repository password. It also hangs with the same messages in the logfile when I only supply the Admin username but no passwords at all, so I guess even though I enter both passwords UA simply doesn't recognize them and fails to present me a error message.
This worked previously in 184.108.40.206.1 (and also in 220.127.116.11), and there where no changes to the .rpd file so I don't think it's the fault of the .rpd file.
Deepika answered it as-
This is an open bug with oracle, refer to the following bug detail in support web,
Bug 14160867: UA UTILITY HANGS AND DOES NOT PROGRESS AFTER STEP 3 ON 18.104.22.168.2
Comments are always welcome...