[Pierre-Marie Baty]

if you get this

WARNING: UDP_OpenSocket: port: 27015 bind: WSAEADDRINUSE
NET Ports: server 27015, client 27005
Could not get TCP/IP address, TCP/IP disabled
Reason: WSAENOTSOCK

then your server is not running on port 27010 but 27015
Try again with the default ports
I have WinXP and I run a dedicated server and a HL client to debug my bots
My command lines are:

server
D:\Jeux\Half-Life\hlds.exe -console -noipx -nomaster -game cstrike +sv_lan 1 +maxplayers 32 +map de_dust2 +developer 1

client
D:\Jeux\Half-Life\hl.exe -dev -console -win 640x480 +connect 127.0.0.1:27015

Try this already, then if it works change 127.0.0.1 to your machine's IP address.