Sorry again for late response, but I think I've found the reason about this issue: WAIT-FOR-INPUT correctly detected that there're inputs on the server side socket, but due to a subtle bug when updating the STATE slot of the socket object, the socket wasn't marked as READY, so when W-F-I was called by (READY-ONLY T), a empty list returned (and your code have no chance to get touch with the stream behind the socket, and nothing could be output ...)

Due to some problems on USOCKET SVN, I cannot commit my work right now, but I have a patch as .diff file in attach, which could solve all your needs. I hope you can take a little download it and apply to your local USOCKET directory and see if your application work well this time.

The bug you reported also affect ECL on Windows, but I don't sync my patch to ECL until I get your positive confirmation.