VMware Horizon View 7.X desktop “Agent unreachable” status

Scenario -: 

We had a VDI user reporting issues connecting to his VDI machine.

Checking View Admin page shows this VDI machine 

First thing first

1) Checked vCenter and made sure that the VM is up and running, not down or suspended. 

2) I could remote desktop to it and checked services

3) Restarted Agent Service. No luck

4) Rebooted VM, no luck there too.

Started to look at the logs at this point

C:\ProgramData\VMware\VDM\logs

debug-2019-12-12-150326.txt

2019-12-12T15:03:35.940+10:00 DEBUG (25A0-26C4) <Thread-4> [AgentMessageSecurityHandler] Configuring message security (ON).
2019-12-12T15:03:36.033+10:00 DEBUG (25A0-26C4) <Thread-4> [BrokerUpdateUtility] Published CHANGEKEY request
2019-12-12T15:03:51.035+10:00 DEBUG (25A0-26C4) <Thread-4> [BrokerUpdateUtility] Timeout waiting for success response

So looks like it was trying to change the Key, but wasn't successful. So I decided to push it from

Connection server instead 

1) Login to one of out View Connection Servers

2) Opened a CMD as Admin

3) Ran below commands

Cd C:\Program Files\VMware\VMware View\Server\tools\bin

vdmadmin -A -d <Name of the Desktop Pool> -m <Machine Name> -resetkey

4) You should be able to see the Agent Public Key listed there and thats all good. 

5) Wait for a few mins and could can see status reporting :)

Reporting as "Unassigned User Connected" coz it was assigned to someone else and I logged in there with Admin ID. So rebooted VM and all good afterwords.


Update - 20/03/2020

We have see the same issue when few users enabled installed Docker and part of that Hyper-V feature was enabled!

Removed Hyper-V feature from Add/Remove Programs -> Turn Windows Feature On/Off

Rebooted the VDI machine and that brought Agent back online