Dell EMC Unity: Unable to refresh managed server esxi host name because of a connection issue

Possible Changes:

• Network changes (Routing, IP etc.) in your virtual environment
• Credential changes on vCenter or ESXi
• Migration of ESXi from one vCenter to another

When polling vCenter or ESXi in Unisphere you receive the following Alert:



"Unable to refresh managed server <server name> because of a connection issue."

Possible causes:

• True connection issue from Unisphere to the ESXi server or vCenter over the IP network
• Hung configuration information from ESXi or vCenter to Unipshere.

Note that after an upgrade to 5.3.x, this procedure is no longer possible, Unisphere won't let you delete any vCenter with existing ESXi hosts. Look at KB 19543 if downtime can be scheduled.

Remove vCenter from Access>VMware tab and then re-add, providing proper credentials.

 **This is non-disruptive to production.  When vCenter or ESXi hosts are removed from the Access>VMware tab, the ESXi hosts are moved to Access>Hosts tab for management.  No initiators are removed.  This process only affects integrated management of your virtual environment, not production and processing of I/O


When you attempt to delete a configured ESXi host with storage attached (Won't let you, this means that as long as you have LUNs attached to the host, you shouldn't be able to Accidentally delete a connected Host):



Delete vCenter or ESXi from Access>VMware:



ESXi host will be moved to Access>Hosts:

 


To add it back under the vCenter, go to ACCESS > VMware > vCenters and under  More Actions  click on  Find ESXi Hosts  or select the  "Plus symbol" to re-add the vCenter:

 

Provide proper credentials and add the host back under the vCenter that manages it: