NET SendPacket ERROR WSAEINTR (Winsock error)

http://support.steampowered.com/cgi-bin/steampowered.cfg/php/enduser/std_adp.php?p_faqid=245

This error is: WSAEINTR (10004) Interrupted function call. A blocking operation was interrupted by a call to WSACancelBlockingCall.

If you receive the following error: NET_SendPacket ERROR:WSAEINTR this is typically caused when your computer is already using the default client port 27005.

This solution might help for other types of WINSOCK errors as well.

Possible Causes:

1. Bad Winsock dll
2. Bad TCP/IP stack
3. Conflicting Ports
4. Firewall
5. ICS
6. VIA KT133A motherboard chipset w/o proper 4-in-1 patch

Possible Solutions:

1. Bad Winsock dll: How to Repair Common Winsock Errors

2. Bad TCP/IP stack: Remove all TCP/IP instances from Network Properties. Fix this by: Control Panel-> Add/Remove Programs-> Windows Setup and remove all of the Communications components.

Reboot your computer and then repeat the same procedure, but instead check the box to re-install the network components.

When that is done, re-add TCP/IP in your network properties to your NIC.

3. Conflicting Ports:

Try adding this to the end of your launch properties:

+clientport 27025

4. Firewall: Zonealarm / Mcafee: Disable them. BlackICE/Norton: Add permissions for ports 27005 thru 27030, UDP and TCP Windows XP SP1 Firewall: no changes required. Windows XP SP2: remove all references to Steam.exe and all instances of HL.exe and let them be re-discovered again, be sure to give permission for all ports, TCP and UDP.

5. ICS Windows Internet Connection Sharing (ICS): disable this.

6. VIA KT133A motherboard chipset w/o proper 4-in-1 patch: Visit http://www.viaarena.com/?PageID=2 and get the latest 4-in-1 patch

(check with your motherboard manufacturer too)