Failure...SQL Server does not allow remote connections

Hi all,
We've got a product which is three tier,
using a .NET Client -> .NET Server which in turn connects to a Sql
Server 2005 Instance.
On top of this we also have a Windows Service which runs nightly
processes also written in .NET
and connects directly to the SQL Server instance.
It's all working pretty well, except that in some installations the
Nightly Processes service
is failing to connect to the SQL Server instance.
We're getting the following message:
________________________________________
_________________________
An error has occurred while establishing a connection to the server.
When connecting to SQL Server 2005, this failure may be caused by the
fact that under the default settings SQL Server does not allow remote
connections
.......
________________________________________
_________________________
This has us confused. The nightly processes is using an indentical
connection string
to the .NET Server. The .NET application is connecting fine
everytime.
The service and the application server are sitting on the same machine
as the SQL Server instance,
so no remote connection should be needed.
The problem seems to happen only on Windows Server Machines/SQL Server
installations vs WinXP/SQLExpress, however that could be unrelated.
Any thoughts appreciated.
Cheers
Chris.Do ou use TCP port ?
If yes do you use autopmatic selection of port number ?
If yes it is preferable to fixed a tcp port to connect to SQL server, using
autoamtic selction of port might affect such connection trouble
Hope it helps
serge
"theinvisibleGhost" wrote:

> Hi all,
> We've got a product which is three tier,
> using a .NET Client -> .NET Server which in turn connects to a Sql
> Server 2005 Instance.
> On top of this we also have a Windows Service which runs nightly
> processes also written in .NET
> and connects directly to the SQL Server instance.
> It's all working pretty well, except that in some installations the
> Nightly Processes service
> is failing to connect to the SQL Server instance.
> We're getting the following message:
> ________________________________________
_________________________
> An error has occurred while establishing a connection to the server.
> When connecting to SQL Server 2005, this failure may be caused by the
> fact that under the default settings SQL Server does not allow remote
> connections
> ........
> ________________________________________
_________________________
> This has us confused. The nightly processes is using an indentical
> connection string
> to the .NET Server. The .NET application is connecting fine
> everytime.
> The service and the application server are sitting on the same machine
> as the SQL Server instance,
> so no remote connection should be needed.
> The problem seems to happen only on Windows Server Machines/SQL Server
> installations vs WinXP/SQLExpress, however that could be unrelated.
> Any thoughts appreciated.
> Cheers
> Chris.
>|||Not as far as I'm aware. It's certainly not referenced in the
connection string?|||See my whitepaper on connecting... it might turn up some issues that you had
not considered.
http://betav.com/blog/billva/2006/0...onnected_1.html
____________________________________
William (Bill) Vaughn
Author, Mentor, Consultant
Microsoft MVP
INETA Speaker
www.betav.com/blog/billva
www.betav.com
Please reply only to the newsgroup so that others can benefit.
This posting is provided "AS IS" with no warranties, and confers no rights.
__________________________________
Visit www.hitchhikerguides.net to get more information on my latest book:
Hitchhiker's Guide to Visual Studio and SQL Server (7th Edition)
and Hitchhiker's Guide to SQL Server 2005 Compact Edition (EBook)
----
---
"theinvisibleGhost" <theinvisibleGhost@.yahoo.com> wrote in message
news:1178703769.427072.296430@.q75g2000hsh.googlegroups.com...
> Hi all,
> We've got a product which is three tier,
> using a .NET Client -> .NET Server which in turn connects to a Sql
> Server 2005 Instance.
> On top of this we also have a Windows Service which runs nightly
> processes also written in .NET
> and connects directly to the SQL Server instance.
> It's all working pretty well, except that in some installations the
> Nightly Processes service
> is failing to connect to the SQL Server instance.
> We're getting the following message:
> ________________________________________
_________________________
> An error has occurred while establishing a connection to the server.
> When connecting to SQL Server 2005, this failure may be caused by the
> fact that under the default settings SQL Server does not allow remote
> connections
> .......
> ________________________________________
_________________________
> This has us confused. The nightly processes is using an indentical
> connection string
> to the .NET Server. The .NET application is connecting fine
> everytime.
> The service and the application server are sitting on the same machine
> as the SQL Server instance,
> so no remote connection should be needed.
> The problem seems to happen only on Windows Server Machines/SQL Server
> installations vs WinXP/SQLExpress, however that could be unrelated.
> Any thoughts appreciated.
> Cheers
> Chris.
>|||Cheers Bill,
I've taken a good look through your page.
I think the most likely scenario might be that the service
is running the local-system account and this may not
have access for some reason, the SQL services are running
under a different windows logon.
The SQL Server instance is running in mixed mode security.
I know where to find the permissions, how can I find out if "Local
System"
has access?
Cheers
Chris|||OK i've checked and LocalSystem already has Connect SQL access,
so I don't think it's that...
Hmmmm...