Why the server got so many connection requests from an invalid socket?

[ngontro86]

Hi,


I am having a big issue when I develop my server. Basically, server is listening on a fixed port from clients. I did some checking to discard those are not from my client. However, I got so many weird connection requests from an invalid socket. This will make our server couldn't do anything useful after running a while! All coming from one IP and they constantly requests to our server... this is for sure not sort of DoS attack.
To see why it's from invalid socket, I check the return value of accept() as:

if( accept(ListenningSock,...) == INVALID_SOCKET) {

}

For more info, I am using winsock2.h Anyone can point me any reasons why?

[ngontro86]

Hi,


I am having a big issue when I develop my server. Basically, server is listening on a fixed port from clients. I did some checking to discard those are not from my client. However, I got so many weird connection requests from an invalid socket. This will make our server couldn't do anything useful after running a while! All coming from one IP and they constantly requests to our server... this is for sure not sort of DoS attack.
To see why it's from invalid socket, I check the return value of accept() as:

if( accept(ListenningSock,...) == INVALID_SOCKET) {

}

For more info, I am using winsock2.h Anyone can point me any reasons why?

Anybody got any clues?

[Banfa]

What does GetLastError return?

[ngontro86]

It returns 0, I guess it resets the error somewhere
I did another version in java, there seems no such weird requests but it still happens in wx + winsock2