Refreshing VMware View fails with error "Unable to fetch data from VCenter: Connection timed out"

Confirm that the vCenter is online.

Log in to the vCenter's vSphere web client using the same user account used to add the vCenter to NetWorker.

root@lnx-nwserv:~# nsradmin
NetWorker administration program.
Use the "help" command for help, "visual" for full-screen mode.
nsradmin> p type: nsr hypervisor
                        type: NSR hypervisor;
                        name: vcsa.amer.lan;
                     version: 7.0.3;
                     comment: ;
                     service: VMware VirtualCenter;
                    endpoint: "https://vcsa.amer.lan/sdk";
                    username: bkupadmin@vsphere.local;
                    password: *******;
                     command: nsrvim;
                       proxy: lnx-nwserv.amer.lan;
              console events: Yes;
                       cloud: No;
              console cancel: Yes;
Snapshot FreeSpace Warning Threshold: 0;
Snapshot FreeSpace Failure Threshold: 0;
        restricted data zone: ;
nsradmin>

Check the NetWorker server can connect to the vCenter:

Use operating system commands to resolve the vCenter name and connect to port 443:

Linux: curl -v vCenter_Name:443
Windows (PowerShell): tnc vCenter_Name -port 443

Optionally, you can use the nsrports command to verify name resolution and port connectivity:

nsrports -t vCenter_Name -p 443

root@lnx-nwserv:~# nsrports -t vcsa.amer.lan -p 443
Forward lookup for vcsa.amer.lan
Query time:              0.001 sec
Canonical name (CNAME):  vcsa.amer.lan
Address (A):             192.168.9.111
Connect to port 443:     Succeeded (0.000 sec)

Reverse lookup for 192.168.9.111
Query time:              0.001 sec
Name:                    vcsa.amer.lan

Increase the Inventory Query Timeout:

NetWorker: Error Fetching vCenter Information for ESXi vCenter Hostname: Reason Dispatcher Request Timed Out