Sadly, this workaround doesn't really help.

I now get crashes in SYS and invalid memory area STR in other, totally unrelated code parts that work totally fine when no http_post is done.
The old version of Survive was pretty stable and the server would only crash very rarely, but this version currently is a mess.

Since I want to release the serverlist fast I guess I have to switch to GSTNet, sadly I need to urlencode the post myself, but I guess I can find some code for that.
EDIT: F***, in GSTNet the Post function doesn't seem to work at all (well, at least it doesn't crash). It doesn't send the post data at all, it seams.

Btw, is the AckNet.dll also using your code or is it made by conitec? I somehow remembered that it was based on your code, but i might be wrong here.