Recently created a brand-new Vcenter 6.7 and have a strange issue with Veeam and the Vcenter firewall.  When I tried to add Vcenter to Veeam it kept failing.  I discovered I had to add an allow rule to the new 6.7 Firewall in the Appliance Management console.  Things worked great for a few weeks until this morning when my backups failed.  I went into the properties section of Veeam and re-ran the credential check and it failed again.  So back to the Vcenter Firewall.  Rule was still in place to allow.  Deleted the rule and re-added it, re-ran the credential check in Veeam and it is working fine again.  The only thing I did was remove the rule and re-add it.  Anyone else come across this?