Hello, I have to ask here, because I'm out of ideas.
What I did: I set up a IPFS node on my win10 laptop, connected via VPN. I added some files and was able to view them via https://ipfs.io/ipfs/
So I installed a IPFS node onto my small Linux Server at home and cloned the files (via "ipfs get") there. Worked like a charm.
On the Linux I can do "ipfs cat" and it works. However if I try to "cat" a file which is on the node nothing happens. Also the node does not seed files to the network. (so if I request them https://ipfs.io/ipfs/ nothing happens).
The Linux PC is inside a private network, but it's placed inside the DMZ of the router. So every request from the outside is directly directed to the PC. I doubt thats it's a network issue...
Any ideas how I can debug why it won't seed data into the network?