Cannot remotely login to SQL Express since last windows update

Since today (after installing the latest Windows Updates !on my local machine!) I cannot login to a SQLExpress instance remotely; stating that it cannot find the server/instance.

The weird thing is: it only happens when I want to login to the non-default instance (sqlexpress 2005) (<IP>\<instance>).

When i'm using the default instance (msde 2000 or sqlexpress 2005 on another machine) (<IP>) it seems to work fine.

Does this have something to do with the windows updates, or is it just a coincedence?

Thanks in advance,

Remco RosThis is probably due to the update changed your setting. Just check your firewall on the server and put sqlbrowser.exe or UDP port 1434 to exception. Also make sure your sqlbrowser is running.|||we didn't install the updates on the server (yet) only on the client, so it must be a client thing.

Server:
Win 2003 / SQL Express 2005
Tcp/ip / named pipes: yes
sqlbrowser running
firewall exception on 1434udp 1433tcp.

tested on these client(s):
Local (without latest updates): CAN connect
XP Home with SQL Server Management studio (with lates windows updates): CANNOT connect
XP Pro with SQL Server Management studio Express (with lates windows updates): CANNOT connect
Win 2003 with SQL Server Management studio Express

(WITHOUT lates windows updates): CAN connect.

I see a pattern here...|||Are you sure your SQL Express listens on TCP port 1433 since your put 1433 in exception? What's the result if you run "telnet yourserver sql_tcp_port"? Can it connect? Could it be possible that IPSEC blocked the traffic between the problem machine if the IPSEC is on?