CLM 5.0.1: Error creating mapping file to migrate to a different server

CLM 5.0.1 is installed in Red hat Linux
Application server: WAS 8.5.5
Database: DB2 10.5

I need to migrate CLM to another server in a different network domain. Public URI need to be renamed. I am at the first step of migration, generate mapping file in the original server.

When I run the command to generate mapping file it gives error about invalid user id. I am using my login credentials using which I am able to login to CLM URL /jts/admin.

 [root@hourh6cciio01 server]# ./repotools-jts.sh -generateURLMappings toFile=mappings.txt adminUserId=ndpotti adminPassword=<password> repositoryURL=https://<server-hostname>:9443/jts additionalURLFile=additionalurl.txt Repo Tools Provisioning using "./conf/jts/provision_profiles". Jazz Foundation - Core Libraries, Version 5.0.1 (RJF-I20140805-1241) CRJAZ1357E The repotools command could not log in to the following server: https://<server-hostname>:9443/jts. Check the login credentials.

[root@hourh6cciio01 server]#

Below is the log file repotools- jts_generateURLMappings.log located at /opt/IBM/JazzTeamServer/server:

2016-05-25 09:30:27,847 Repo Tools
2016-05-25 09:30:27,848 java.version=1.6.0
2016-05-25 09:30:27,848 java.runtime.version=pxa6460sr16-20140418_01 (SR16)
2016-05-25 09:30:27,853 Provisioning using "./conf/jts/provision_profiles".
2016-05-25 09:30:27,883 repotools-jts -generateURLMappings additionalURLFile=additionalurl.txt adminPassword=************** adminUserId=ndpotti repositoryURL=https://hourh6cciio01.houston.ibm.com:9443/jts toFile=mappings.txt
2016-05-25 09:30:27,889   Jazz Foundation - Core Libraries, Version 5.0.1 (RJF-I20140805-1241)

2016-05-25 09:30:29,212 CRJAZ1357E The repotools command could not log in to the following server: https://<server-hostname>:9443/jts. Check the login credentials.