"Read timed out" error, player cannot connect

Hello
I have got this 1.2.4 Minecraft jar and its clean..
I have updated my java too.
A clean new server using the lastest MC 1.2.4 build
Ima hosting my server through hamachi atm and My friend who has windows atm.
he keeps getting this error

13:45:17 [INFO] Read timed out
13:45:17 [SEVERE] java.net.SocketException: Socket closed
13:45:17 [SEVERE] at java.net.SocketOutputStream.socketWrite(Unknown Sourc
e)
13:45:17 [SEVERE] at java.net.SocketOutputStream.write(Unknown Source)
13:45:17 [SEVERE] at java.io.BufferedOutputStream.flushBuffer(Unknown Sour
ce)
13:45:17 [SEVERE] at java.io.BufferedOutputStream.flush(Unknown Source)
13:45:17 [SEVERE] at java.io.DataOutputStream.flush(Unknown Source)
13:45:17 [SEVERE] at net.minecraft.server.NetworkWriterThread.run(SourceFi
le:103)
13:45:17 [INFO] Ryana1997 lost connection: disconnect.endOfStream

Please tell what is wrong

 

same here

 

Yea its totally annoying me, because i have to make this big flim for school and if i dont get this to work ill fail D: