Well, no one else has responded to this thread. This makes me sad. T_T
I'm still getting the error and frequently. I got the error less than 10 minutes after launching the server once. Mostly, though, it takes several hours to half a day for it to happen again.
Here's a screen shot of it happening. If I scrolled up in the console, it'd show that one blasted line as far back as the console logs.

http://dl.dropbox.com/u/1129844/AoS%20Error.png

Any other ideas? I see that Pyspades released a new Windows binary yesterday, I might just do that...

That is what I'm running. The official server. Vanilla meaning no modifications to it.

In this case, I recommend deploying the official (Yes default, but more reliable) Ace of Spades server. My recommendation comes weak-backed, but there is almost no negative issue with the default server setup, in which prerequisites the server to function at all.

Did you try to restore the server files or software?

No firewall. This is running on Win2k3 server.
I'm running the official vanilla server until pyspades becomes more stable. >.>

From what little I can tell, I understand it is a bug or glitch in the Operating System. It could be your firewall is acting up as not intended. That, or there may be signal interference within the router's vicinity.

Are you using pyspades or the official Ace of Spades setup?

I can't tell you how many times I've restarted the server, both the console and the physical machine. It can't be (just) an IP change because it can happen several times a day, and I don't lose my Internet connection that often.
If this bloody server would timestamp events I could check my router logs and see if anything suspicious was happening then, but I never catch it until long after the fact.

Huh. That is odd. It hasn't occurred to my server, yet at least. Though I do get the occasional "Disconnected from Master Server", at which point I re-launch the server, and from there it works stable enough.

My advice is next to naught in effect, perhaps. Albeit, perchance a couple of restarts, and check your IPv4 - mine changes now and then at a variable rate.

I have no idea why this happens, but it happens WAY too often. I'll be running the server for awhile, sometimes 10 minutes or 2 hours, and I'll get this cryptic error message in the console:
"Error sending outgoing packets: No Error"
It usually pops up about 100 times in a row too, followed by:
"Disconnected from Master Server"
This is crazy. I'll be in a game and never know it even happened. The game doesn't lag, I just suddenly notice that the server is dwindling down on players and no one new is coming in and check the console and sure enough, every time, this is what I see. Why doesn't the darn server even try to reconnect after that?
Any advice or commiseration would be appreciated.

I'm honestly starting to get REALLY annoyed at people that read the title then give u generic advice, at the very least people need to read the whole OP before they host, if not the entire thread.
this same bug seems to have been unfixed for a long time, i wonder if ben even knows what the cause of the bug is, not to mention how to fix it

Its not a portforwarding problem, and kirk im having the SAME one. People need to realize that this is a real BUG and not just something to ignore. At one point i managed to put a server up with Pyspades to test it. But the next day i cant.

USE THE SEARCH BAR ON THE TOP LEFT OF THE PAGE PLEASE!.
There are hundreds of threads about this.

But other wise you need to forward 32887 UDP port on your router to your PC.

--> http://ace-spades.com/forums/search.php?q=portforward <--

How do u forward the ports and what ports

Okay, I guess I'll keep trying then. Good to know it isn't my fault.

Thanks a lot

I've had the same problem, but usually, a few master server reconnects make it work (that'll be restarts for the vanilla server). I can only guess what's wrong with the master server, but I suppose it's messing up with the newly-introduced IP fetching stuff.

I cant seem to host a server anymore. last week, I had a bridgewars server that worked completely fine. But now, whenever I try to start a server, it says 'disconnected from master server' after a minute, and my server never shows up on the list.

The problem is, I haven't changed ANYTHING. My ports are still forwarded, and I have no idea what to do. I'm just trying to host a normal server, no pyspades involved.

I hope I explained my problem clearly.