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Ubuntu networking issue on OCI

pm flag

I an using Ubuntu 20.04 on Oracle Cloud (OCI), and struggling with accessing my web server from another host in the same subnet. Remote SSH works, ping/traceroute works, only having troubles with port 8080 on TCP.

From locally, I can access the web server on the subnet IP (it is bound to 0.0.0.0):

Accessing port 8080 locally

Firewall is disabled:

Firewall disabled

Routing table seems to be OK (both instances have the same RT):

Routing table

From a remote host on the same subnet it fails with No route to host.

Failing from the same subnet

Considering the network, everything seems to be correct, I set up an everything-to-everywhere rule in OCI for this subnet. My gut feeling is that there's something on Ubuntu side I don't know about. Something must be enabled to be able to open a custom port.

Feel free to ask, I'm fighting this issue for a while.

David avatar
cn flag
Are you using UFW on Ubuntu and if so the port is open.
gaborsch avatar
pm flag
@David `ufw` is disabled. I tried also with `ufw` on, and adding an allow rule for TCP/8080, but did not work either.
gaborsch avatar
pm flag
I have the same issue on the other web server, and also from the load balancer (that's the most painful :D )
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