RMAN-03002: failure of restore command at 07/16/2015 20:08:00 RMAN-06004: ORACLE error from recovery catalog database: RMAN-20005: target database name is ambiguous

RMAN-03002: failure of restore command at 07/16/2015 20:08:00
RMAN-06004: ORACLE error from recovery catalog database: RMAN-20005: target database name is ambiguous

The above error was encountered whiles trying to restore a control file to a different host.

Solution:

Set DBID to that of the source database and attempt the restore again. Obtain this from the source database.
syntax: RMAN> set DBID=2378162372

 rman target / catalog rman/XXXXX@CATDB msglog=/tmp/controlfile_restore16jul2015.log
RMAN> set DBID=2378162372
RMAN> run
{
2> 3> allocate channel CH01 type 'sbt_tape';
4> allocate channel CH02 type 'sbt_tape';
allocate channel CH03 type 'sbt_tape';
5> 6> send 'NB_ORA_POLICY=hostname-XXX-HOT-WEEKLY,NB_ORA_SERV=nbumaster,NB_ORA_CLIENT=hostname,NB_ORA_SCHED=Default-Application-Backup';
7> restore controlfile from tag TAG20150716T191835;
8> release channel CH01;
9> release channel CH02;
10> release channel CH03;
11> }