VMI Error - WMI is Unavailable

[Enzo]

Hello team.

A change was made to the network, and a new firewall was added to perform a network segmentation. I moved a workstation behind the new firewall. I tried to perform a new scan on the workstation but it is giving me the following error:

RPC Unavailable

When I try to use the Connectiontester tool the information that is displayed is the following for the workstation that is behind the firewall:

Ping: ok
Scanning TCP ports.
135 Open (EPMAP)
139 closet
445 closet

Checking reverse DNS
I need to check the information of the workstation.

Scanning Netbios (UDP)
Could not scan netbios

Scanning netbios (445)
Could not scan netbios

Scanning Active Directory
Operative System: Windows 10 Enterprise

Scanning WMI
WMI is Unavailable

Checking c$ Access
Deployment folder: OK
Access Rights: OK

[Jacob_H]

Yo Enzo - I'm not official support but....  try working with the firewall team to open port 139 for your endpoint you are testing on (only), then retry.  I think WMI + RPC require file and print sharing protocols that communicate over 139.   Or, if they don't want to loosen the rules for your endpoint, have them trace or view the rule/traffic logs for your endpoint and confirm.

[Enzo]

Hello Jacob.

The workstation I'm using for testing was connected to the same network where the Lansweeper server was and everything worked perfectly. After that I just changed the IP address of the workstation to put it behind a new firewall that was installed. I don't think the workstation is the problem.

Thank you.

[Jacob_H]

Hey Enzo - I'm not suggesting that the workstation is the issue - rather, I'm suggesting that you use that same endpoint to see what the firewall is doing or potentially blocking.   Troubleshooting step #1 is reverting (i.e. changing the IP address and putting it back outside of the firewall's reach, and test again.  if #1 works, have the firewall team monitor the traffic rule or the IP address of your endpoint as you try to scan it -  does that make sense?   

[Enzo]

Hi Jacob OK, I'll run that test and verify that the computer is working properly outside the firewall.

[FrankSc]

Hello Enzo, 
This is most likely caused by your firewall. But there could be a few other causes. 

These are outlined in the KB article below along with possible solutions.
The RPC server is unavailable. 0x800706BA - Lansweeper