Please consider moving this question as-is (no need to recreate) to the proper forum for maximum visibility.  Questions written to the users' own "Discussions" space don't get the same amount of attention and can go unanswered for a long time.  You can do so by selecting "Move" under ACTIONS along the upper-right.  Then search for and select: "CLARiiON Support Forum".  CLARiiON Support Forum  You've tried quite a bit already so let's see what others suggest once you relocate this post.  In the meantime, if you haven't already, I'd recommend opening up a ticket with EMC support.
We moved a CX4 from our datacenter to our office, and reassigned a new IP. Now, I can't add or remove the CX4 from any domains. Attempt to remove from current domain sais "Master not not reachable", Attempt to add to new domain sais "New master not participating in current domain." So, stuck in a loop. Can't remove from old domain and can't add to new domain.  Attempt to remove old IP address: > naviseccli -h cx1-spa domain -remove 172.17.106.70 -o Domain remove operation failed. The Master node is not reachable.  Attempt to remove new IP address: > naviseccli -h cx1-spa domain -remove 10.0.16.2 -o Domain remove operation failed. The Master node is not reachable.  Attempt to reassign master node: > naviseccli -h cx1-spa domain -setmaster 10.0.16.2 -o Domain set master operation failed. The new master node is not participating in the current domain
Moved CX4, now can't change domain config