CrunchBang Linux

Hi everyone

I have some trouble with my home server for a while and everytime it's the same problem.

The server is an old computer (cpu: 1333GHz, RAM: 256Mo, IDE HDD) with crunchbang.
What I am trying to do is to manage to control downloads on this server with JDownloader and its web interface.

The web interface uses the port 8765 with a https protocol.

I also use a ssh connection with the port 22 and a WOL Magic Packet Sender on the port 9.

I have opened all these port on the routeur (a Livebox) and I redirected them to the local IP of the home server.

The home server is connected to a switch and the switch is connected to the Livebox.

I eventually use Dyndns to trace my routeur's IP on the web.

Now the problem:
During a short period of time, it worked well. Last night I managed to go on the web interface and to use putty via my smartphone and an other computer, everything was ok. (using the web, not locally)

But this morning, when I tried to refresh the web interface page, nothing, the connection was lost.

"chromium could not load the webpage because xxx.xxx.xxx.xxx took too long to respond. The website may be down, or you may be experiencing issues with your Internet connection."

A friend of mine told me port number higher than a certain number could be changed randomly. Is it true? Could it be the problem?

Before I installed crunchbang on the homeserver, it was Archlinux, and it had the same problem, so I don't think the problem comes from linux.

I hope it is not a hardware problem.

I could ask to someone tonight to check if the homeserver is still downloading.

Does any of you have an idea to solve this problem?

Thank you

(I am French so forgive me for any mistakes, but you can let me know)