What is the correct way to allow connection from guest to an application running on host machine?
Example setup:
- some application running on my Win 10 host machine, say NodeJS app on port 4400
- guest OS in Hyper-v connected with Default Switch, eg Ubuntu 18.04 created via "Quick Create"
Windows Firewall blocks connections from guest to host:
2019-10-09 10:18:21 DROP TCP 172.17.147.6 172.17.147.1 59560 4400 60 S 3734288315 0 29200 - - - RECEIVE
That's is no surprise, because there's a rule "Node.js: Server-side JavaScript" that blocks traffic in "Public" networks, which is the type of network, assigned to Default Switch, created by Hyper-V.
What is surprising is that it worked before. Couple of months ago it worked for both NodeJS apps and Java apps. A week ago I tried the already existing setup, but was not able to access an app running at 9290. I tried to fix it, resetting Windows Firewall, but then lost ability to access 4400. I reset/reinstalled Hyper-V and NodeJS, hoping it adds some magic firewall rule to no avail. Still I can't see a reasonable rule that would allow access to NodeJS apps in "Public" networks.
So, what could be the magic, that allowed guest accessing host apps?
