Evasi0n NetDB Open nodename Internal Server Error and POSIX errors in Cydia
With the recent release of Evasi0n 1.0 for iOS6, literally hundreds of thousands of people are slamming the Cydia servers and repos right now, trying to get all their favorite jailbreak tweaks installed. Unfortunately, all this congestion means that it is going to be more-or-less impossible for anyone to install anything for the next few hours. No matter what you try to install, you will likely be met with a red error in Cydia along the lines of "NetDB: Open nodename nor servname provided, or not known." "HTTP/1.1 500 Internal Server Error" or "POSIX: Operation timed out"
Unfortunately, there is nothing we can do about this but wait. Eventually the traffic will even out and calm down as more people get their devices jailbroken and then Cydia should start running smoothly again. This is an unfortunate downside of every jailbreak due to the demand placed on the servers upon initial release.