can't access named instance by it's name

Hi,

I have sql2005 sp1 active-active installation.

I've fixed the named instance port.

I can't reach it from clients with i'ts name (servername\instancename) .

I manage to rech it only by using servername, ip-port.

The sql browser has the following error:

"The configuration of the AdminConnection\TCP protocol in the SQL instance GILBOACL is not valid."

your help is appreciated!

Shahar

1. Is UPD port 1434 open?
2. Does the browser service account have access to the registry key? See the following article for more info.
http://support.microsoft.com/kb/905618