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What specifically did you change in your Network Gateway?
Only the IP Address changed from A.B.C.D to A.B.C.E
That's what I thought. In your question mentioned that no IP was changed.
Recently we had to change the network gateway for our 2 node MySQL cluster running on top of Oracle Grid (RHEL). None of the IPs changed. We noted the following behavior:
Can you look in the location below and make sure that the file reflects your changed IP.
/etc/hosts
The gateway IP address is not in the hosts file, it is (and has only ever been) in a routing table.