Currently I just upgrade my 4 production servers from Server 2012 to Server 2012 R2 and rebuild my Cluster with the same IP. But I encounter an issue that my cluster validation is failed because of 2 server's iscsi port is unreachable to other node. Below
are the screenshot of the error. I have went through some articles and tried to solve it but still failed. Besides, I also turn of the windows firewall for 4 nodes for temporary testing.
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Cluster Validation - iSCSI port unreachable to UDP 3433
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