If you are protected by a hardware firewall, at least make sure that you have changed the default admin password which is a common vulnerability and vector of attack from the miscreants - and very easy to compromise. Also, if an experienced enough miscreant wants to get into your system (there are ways with half-baked packets) they will, but only if they notice you do not have stealthed ports. As it stands now, if a miscreant notices your open ports, they can get into your system and if they know what they are doing cause problems - I'm sure you do not want that to happen. The point is that a closed port indicates to a miscreant that there is a computer at the ip address, while a stealthed port indicates that the miscreant should not bother with the ip address under scan and move on to another ip address. Then test with nmap to verify that all of your ports are stealthed. At the end of my post is a link to a Beginner's version setup of iptables that should be able to close all of your ports if you comment out the services that are allowed (I do not use them) in it with a '#' at the start of those statements. (I went nuts trying to solve a connection issue a few years ago until my ISP discovered that there was a corroded connection in their box at the street.I do not know if you run any software firewall on Ubuntu, however, I would advise you to either get Firestarter (if you are gui inclined) or learn how to do it with iptables in terms of the Beginner's version thread I posted in this forum here. And ask your ISP to check their cables in your area. Take a look at some of the more advanced diagnostics suggested i n Nalates's blog. Check all your cables to be sure the cat hasn't bitten through one, or you haven't rolled over it with your chair. Bypass the router temporarily - just plug the cable from your computer directly into the modem - to rule out a problem in its hardware or software. If you've rebooted everything, start working up the line. On the basis of probability, if nothing else, it's more likely to be a problem in your neighborhood. And if you were, we'd probably hear from a lot more people with your symptoms. If you're having this trouble everywhere you go in SL, it's unlikely that you are unlucky enough to keep finding sick servers everywhere.
In fact, there are something like 10,000 of them.
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