if you use glftpd as ftp server, you might run into
user@server:/# ftp localhost 12345
Connected to localhost.
421 Service not available, remote server has closed connection
Archive for category network
Microsoft Sharepoint Services 3.0 with seperate MSSSQL Server.
When you try to access http://sharepointserver/site after finishing site setup, you might get the following
message “Cannot connect to the configuration database”
After the crypto bug got fixed in debian (and the system got updated via apt) it would prompt one for regeneration of certificates.
what i forgot all about, was that of course OpenVPN was affected by this aswell, so after the update and a reboot, all my vpn connections died suddenly.
Teaming 2x 1gbit network adapters with the HP utility usually dosnt take much more than a few minuts
alltho, this time a strange thing appeared.
So i finally pulled myself together and formatted my server (4 years since last time i did a full reinstallation)
usually i just upgrade the kernel, but hey, time for some cleanup!
i save the .config file for the running kernel, as lazy i am, no need to spend more time than necessary.
since i decided to make it my router, i had to compile iptables support. which i did, and compiled rest of the netfilter/iptables related stuff as modules. so the weird thing was, while i were trying out an old iptables rules script
i got an error like
iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
FATAL: Module ip_tables not found.
iptables v1.3.8: can’t initialize iptables table `nat’: Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
First i reinstalled iptables which made no difference, then the kernel again (included a few useless modules)
and i still got the error.
anyway, it seems like it can be rather unhealthy to use your current kernel config everytime you compile a new kernel, since there are some options which arent updated(no questions asked)
anyway, i did a make menuconfig, removed the support for networking (Networking – [*]Networking Support)
save the config file, opened it again, and enabled the support. all the original settings were removed, and i had to config it from scratch, but to my big surprise, i suddenly had alot more options to play with. and after compiling the kernel, rebooting – the problem was fixed 
This is usually pretty much useless for almost everyone using PPPoE these days
but since i recently got fiber installed at my place, and my isp got a thing for PPPoE
and also got multiple access concentrators (servers you can connect to, providing redundancy) i got a small problem since i hooked up the link directly to my linux gw.
It surprises me that there’s a lot of people out there who know about WOL (wake on lan), the ability to
Remotely turn on your pc/server via the network card. But doesnt know that you can do it from the Internet, and not just on your home network.