Can anyone tell me why the dedicated host is producing the following line at a regular basis: 'Joiner: could not set TCP_NODELAY'?
And if this blocks people joining the server, how do I solve this?
Running version 0.5Y under Vista..

TCP_NODELAY is a setting on the socket (the communication method between 2 pcs, or programs). What it does is basically force the data to be sent, regardless of the amount in the buffer.

You may find under your network card's device settings that you can allow nodelay to be set, or not. Check there, and also check for any updated drivers.