Here is an updated version from previous post (UCF troubleshooting) with some more/new tips:

UCF installation paths:

• Windows XP: C:\Document and Settings\[user]\Documentum
• Windows Vista/7/8: C:\Users\[user]\Documentum
• Linux: ${home}/Documentum

Timeout/browser/jre problems:

• Check the supported environment tables in webtop/da release notes. Most JRE versions will work even when aren’t supported, but you’d better check if the supported version works.
• If not needed, disable ACS and BOCS.
• If using a proxy, add host’s IP and hostname to the proxy exceptions
• Add Webtop url to the browser’s pop-up blocker exceptions.
• In case the UCF aplet cannot be installed, try disabling DEP protection
• Delete the local UCF installation and try a clean installation
• [Firefox] Check Java plugin is enabled. Mozilla automatically disables outdated JRE plugins.
• [IE] Check Sun/Oracle JRE is the default JRE, disable ActiveX filtering, and check Java plugins are enabled in the Manage Addons window.
• [IE/Firefox] If you are working with a 64 bit SO, check you’re using a 32bit browser with 32bit JRE. 64 bit browser/JRE with UCF is probably a bad idea.
• [IE] Check Java integration with browsers is enabled.
• [Java control panel] Delete JRE cache
• [Java control panel] Disable the next generation Java plug-in.
• [Java control panel] Disable verification of mixed code security.
• [Java control panel] Check “Direct Connection” is selected in Network Settings (vishnu.music)
• [UCF configuration] If UCF keeps throwing a timeout, disable the IPv6 compatibility by changing the following line in ucf.installs.config.xml (located in ${Documentum_UCF}/ucf/config)

<option value=”-Djava.net.preferIPv6Addresses=true“/> to <option value=”-Djava.net.preferIPv6Addresses=false“/>

JRE 7u51+ workaround:

In Java control panel check that:

• Security is set to medium
• Your application server url is listed under the exception site list

You should also check the thread The specified discussion was not found. by PanfilovAB if you’re having issues with multiple Java versions

Manual installation:

• You can install the UCF applet in the client computer manually, just run the folowing bat script:

set DIRNAME=%~dp0%lib\
set URLDIR=%DIRNAME:\=/%
java -cp %DIRNAME%ucfinit.jar com.documentum.ucf.client.install.TestInstall "file:///%URLDIR%" "ucf.installer.config.xml"

This is the structure/files you need for this script to work (you can find these files in /wdk/contentXfer/):

UCFTestInstall.bat
\lib
\lib\ExJNIAPI.dll
\lib\ExJNIAPIGateway.jar
\lib\jacob.dll
\lib\jacob.jar
\lib\ucf-ca-office-auto.jar
\lib\ucf-client-installer.zip
\lib\ucf.installer.config.xml
\lib\ucfinit.jar
\lib\UCFWin32JNI.dl

And don’t forget to check UCF logs if you’re still having problems