Update CMS - Getting DTR Server exception Error

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Hi,

We have done a heterogeneous migration of JDI from AIX to HPUX.

Im performing some post installation activities for the usage type DI.

So i tried changing the CMS and SLD URL's in the "Domain Data" tab to reflect to the new target system URL's.

But im getting an error when im trying to do a "Save Domain" or "Update CMS".

Error: DTR (URL http://<old host name>:54000/dtr) server exception: Communication problems occured with repository "http://<old host name>:54000/dtr". Unable to open connection to host "<old host name>:54000". The IP address of the host could not be resolved. Maybe the URL is misspelled or the host does no longer exist..

i feel the DTR is not showing up the new target system URL though i changed the Name Server Configuration to reflect to the new target system URL in the following link "http://<new target system name>:54000/dtr/system-tools/administration/NameServerConfiguration"

I have not changed the CIM URL of the SLD thats defined in the techinical landscape. could this be the cause of the error ?

Any suggestion is highly appreciated...

Thanks

Sourav