Hello i think someone hacking my linux debian server. i have a minecraft server on it. yesterday the my internet died 3 times and it was only the internet. the LAN works. i needed to reboot the rauter to get back my internet. and when i turn off the server computer the internet works fine. hacker??

can i get some tips how to protect my server and internet

i have linux debian 6.0.3
minecraft server port is 25565 and 25566

sorry for my spelling :P

Your question is very generic in nature and you may not get the best response. You can take a look at the following guide for Linux security info: http://tldp.org/LDP/solrhe/Securing-...ution-v2.0.pdf

Could've just been your ISP having a hiccup. A simple internet disconnection isn't necessarily the sign of a hacker and the best place to check is your /var/log anyways.

He brings up a good point, have you talked wiht your ISP about your upstream limit? Running a server, esp a hosted app like MineCraft or a Game server will consume quite a bit of upstream data and they may be killing your connection to prevent you from using it if you are not paying for it.

Checking with your ISP a good initial step. You should also focus on gathering data and evidence to determine if there is a problem and if so, to define the nature of the problem so that proper measures may be taken. Given the nature of your system, a game server, it is entirely possible, if not reasonable to expect, that you are being subject to malicious traffic. Consequently, a traffic analysis would be in order. To perform this analysis try using a combination of netstat to see the number of concurrent connections, ntop to see if you have a bandwidth hog, and tcpdump with a bpf filter and see if you can get a pcap dump for traffic analysis. See this thread (page 3) for some insights: http://www.linuxquestions.org/questi...100/page3.html

ok but a player told he come to hack the server

You are going to need DATA to solve this problem. You need to obtain either router logs, or some other form of traffic analysis to determine the problem. Until you have obtained data, the rest is just useless speculation.

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ok but i can log data on the router but i can see the logs xD

Just an idea. I had a same issue and finally I found out that my router after cca. 3-4 years had such a serious holes that the ISP released a firmware upgrade. I upgraded the firmware and now it works fine.
Did you check whether the manufacturer of your router doesn't release a new firmware upgrade?