Found an error in the EQL configuration.  When I added the new server to the access control list for the volumes, I had an * for CHAP rather than the appropriate information.  All is well once again. Thanks,
I have 2 Dell PowerEdge R640 servers both running VMware ESXi 6.0.0 5572656.  One that is about 6 months old connects to my Equallogic PS4100 without issue, my new one is set up exactly the same but I receive the 7.4.3 login to target failed, reason: "Initiator is not authorized for this target" error.  I have no access policies and no CHAP configuration.
Event ID: 7.4.3, iSCSI login to target from initiator failed