My system is Slackware14.1 and KDE 4.10.
Now I'm in trouble, as PC is intruded when it does't connect to Network and internet.
but regrettably, I can't hide only any username and passward.

What is supposed, is through
1. wireless network.
Its demon isn't active.
2. power line communication.
I did't know entirely the way to prevent this.
Would you teach me these prevention?
In addition, I'd like to know how to stop port 6000 at KDE desktop.

Thanks for your helps!

Do you have powerline networking appliances installed in your location? It can't be done without special equipment.

What evidence do you have of intrusion?

Also, if it's not already installed, install fail2ban.

If you think this intrusion is coming from outside, you should be able to close down port 6000 in your router. Otherwise, you can do it in iptables. If you do not have a good frontend for iptables, I can recommend ufw; there's a Slackbuild for a KDE GUI frontend for ufw.

Frankly, if you think someone who has physical access to the machine is accessing it and you cannot hide your user name and password (is this maybe a school or company machine, rather than your personal machine?), there may be little you can do in software.

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Thanks your teaching!

I have no powerline network appliiances.

And no evidences, but in standalone, cups printing have gone to abnormal behavior, and when I use scim-anthy in Japanese input, the candidate of transformation is occasionally gone back to the default though this must be the newest. This two wrong behavior are problems.

When anyone boots my PC or shutdowns, the date-time is logged the file, therefore anyone didn't operate physically, but someone may go into my room.

Now, I installed fail2ban and kcm-ufw. Also before I use iptables firewall and so make the drop rule of port 6000, but nmap shows that 6000 is opened.

Thanks good advices.

Thanks for the update.

6000 is used locally by default, it's the port Xorg uses and it doesn't allow network connections unless you explicitly configure it to do so.

Thanks for the detail information.