.net - asp.net website and sql server join to domain -

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i have asp.net web application running on webserver, uses database server (the same server). working fine, until joined server domain.

the following error happend on web application:

a network-related or instance-specific error occurred while establishing connection sql server. server not found or not accessible. verify instance name correct , sql server configured allow remote connections. (provider: named pipes provider, error: 40)

when connect sql server via sql management studio localy works normal. maybe in connectionstring?

that error means either sql server hasn't had remote connections enabled, or there no sql instance @ location specified in connection string.

as have joined server domain, possible server name has changed? trying connect user has rights connect?

edit: try using connection string:

database=db;server=.\[instance name];user id=sa;password=pwd;

note .\, , need fill in default instance name. if have sql browser service turned off not able find default instance unless explicitly identify in connection string (you may going when connect ssms).


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