Windows server 2022 still blocking port with firewall off...any idea what's blocking it?

Question

Device: Windows Server 2022 running on a VM

I need to allow access to port 8820 on the server above. With windows firewall ON I added a rule to allow traffic to that port, then ran the following powershell command to test it from another device;

tnc "computername" -port 8820

It failed, so I used the same command to test port 3389, this failed as expected as there is no rule to allow it, created a rule for 3389 ran the test again and it came back as working. Disabled the 3389 rule and tested again and failed as expected.

So, turned the windows firewall off completely, ran tnc command on 3389, works....ran test on 8820, still fails :(

Disabled the mpssvc service altogether...still no joy, ran RSOP and checked though the polices and there's nothing in them that suggests it block anything.

Anyone have any idea's on what's blocking the port

Phil

PS Have turned off all AV

Answer 1

USE Get-NetTCPConnection -LocalPort 8820?Ensure that your VM's network configuration allows inbound connections on port 8820.