If you are using CLM 3.0.1.x with Rational Insight 1.0.1.1 then you must
install this hotfix. In fact, without it your ETLs will stop functioning
with the upcoming CLM 3.0.1.2 and Tomcat due to a protocol change.

It also fixes two other import issues:

(1) Without the hotfix, errors that happen during REST calls are not
propagated from the XDC driver to the Data Manager. You miss that
something went wrong and your Data Manager logs only show a success
message. In the past you had to review the entire ri_jdbc.log file for
errors. With the hotfix errors are no properly reported in the DM log
files.

(2) There was a big confusion about the XDC Editor reporting a warning
when using the Test Connection button. The connection would indeed
succeed with the xdc files downloaded from the CLM servers, but many
people would interpret the warning telling the user that a resource was
not found as an error and started changing the authentication settings,
which would break the ETLs completely. This hotfix revised the warning
messages and provides an additional field for a resource path to
properly test the connection. For example, add /testcase for the rqm xdc
file or /rpt/repository/workitem for the workitem xdc to run the test
now checking an actual resource.

Get the hotfix here:
ftp://ftp.software.ibm.com/software/rational/private/RAT5-1lDLVRNkbxY5/

If you are using RRDI, no action is needed.

Hope this helps,
Peter Haumer.