On the server:

1. Go to: Start, Control Panel, Windows Firewall
2. Turn Windows Firewall off for Domain Networks, Private Networks, Public Networks or add a Port Exception:

To add a port exception to the Windows Firewall:

1. Log in to the computer as an Administrator. Click Advanced settings.
2. Right-click Inbound Rules, New Rule, Port, Next.
3. With the dot in TCP (default), with the dot in Specific Local Ports: Enter the value 2638 (Network) or 1433 (Premier), and click Next.
4. With the dot in Allow the Connection, click Next.
5. Check all boxes for Domain, Private and Public, click Next.
6. Enter a value in the Name: field click Finish.
7. Repeat the same to add Outbound Rule.

On the client:

1. Go to: Start, Control Panel, Windows Firewall.
2. Turn Windows firewall off for Domain Networks, Private Networks, Public Networks or add a Port Exception:

To add a port exception to the Windows Firewall:

1. Log in to the computer as an Administrator. Click Advanced settings.
2. Right-click Inbound Rules, New Rule, Port, Next.
3. With the dot in TCP (default), with the dot in Specific Local Ports: Enter the value 2638 (Network) or 1433 (Premier), and click Next.
4. With the dot in Allow the Connection, click Next.
5. Check all boxes for Domain, Private and Public, click Next.
6. Enter a value in the Name: field. Click Finish.
7. Repeat the same to add Outbound Rule.