Hello,

If been trying to setup webhooks to automate jenkins builds since few ‘days’ (not continuously of course) but miserably failed.

Environment: Debian 10.11

My jenkins server resides behind an nginx reverse proxy (a 2nd physical host) which serves as the SSL frontend so it’s used to do a portforwarding of the SSL port towards default 8080 port. On the nginx server/reverse proxy I have a firewall setup which blocks everything except for IP’s that I allow.
If I disable firewall on the nginx server everything works as expected.
Firewall enabled: “Failed to connect to host” as result in the github webhooks recent deliveries.
So the missing link are the correct firewall settings imho.

I have found the meta page (https://api.github.com/meta) and added the subnets from the “hooks” section with no limitation on port or protocol.
The incoming address (with the firewall off) is 140.82.115.146 which is part of the 140.82.112.0/22 as found on the meta page. I have added that address explicitly in the firewall rules, but to no avail.

EDIT added ufw status numbered ouput:

> [68] Anywhere                   ALLOW IN    192.30.252.0/22           
> [69] Anywhere                   ALLOW IN    185.199.108.0/22          
> [70] Anywhere                   ALLOW IN    140.82.112.0/20           
> [71] Anywhere                   ALLOW IN    143.55.64.0/20            
> [72] Anywhere                   ALLOW IN    140.82.115.146

I am most confident that someone here has already put in place the same setup, so if he/she can shed some light or give a hint I would be most grateful.

Yes read about things like smee.io but I don’t want to add another hop for something this trivial.

kind regards,
DragonPi