Zerto: VMDK Cannot Be Synced Because It Is Inaccessible

Problem

After upgrading vSphere 6.5 to 6.7 U1 the VPG I was protecting failed witn the error: VMDK cannot be synced because it is inaccessible 

zerto_inaccess1

Troubleshooting

The vsphere user  (linked to AD) account used with zerto had access to the DS

I was already using Zerto 6.5 U2 -which was the first release that supported vsphere 6.7 U1

 

Resolution

I simply had to do a site re-configuration via the ZVM VM