IdTCPServer Freeze on Delphi

[rlebeau]

when the number of clients exceeds 1500, the server freezes.

1500 *simultaneous* clients? Because that would mean your process is running 1500 concurrent threads (1 thread per client), which is likely to take up way too much memory. The default thread stack size is 1-4MB, depending on project settings, so 1500 simultaneous clients would be using 1.5-6GB of memory. Indy is not designed for that kind of load. You would need to reduce the number of simultaneous clients, or lower the default stack size. But, on Windows at least, you really need to use Overlapped I/O or I/O Completion Ports to handle that kind of load efficiently, and that is not supported by Indy at this time.

If you test it, you will see that it is frozen

I can't test it right now (no working IDE).