Yesterday I asked this question.
Basically all I wanted to find out was the debug solutions to diagnose problems with tcp resubmission. For example if we want to find out about possible routes we use traceroute tool.
The moderator closed the question in just a few seconds after it was posted. In the comments he mentioned " It is obvious that the problem lies in your applications because it works with websockets or HTTP, which use TCP, but your use of raw TCP sockets seems to be flawed". This proves the quick reaction, because I had mentioned that my application works with VPN and other operators. When in the comments I told the moderator about this, he then gave up on the application logic and said: "questions about networks not under your direct control, such as the public Internet, are off-topic here, and you need to discuss that with your ISP."
I called my ISP, interestingly they told the same: We don't support networks we don't have access to. (Meaning the servers my application was tested on).
I strongly disagree with calling this question off-topic. In a community of Network Engineering, I'm sure there are people who could lead me to find out about troubleshooting this case.
At least they can help me persuade my ISP with technical reasoning, or even if this is something about the application itself, they can point out about possible reasons of the application working on some networks and not on others.
Closing the question in just a few seconds after it was published is not a nice way to welcome a new contributer.