Strange Remote Connection Problem

Feb 16, 2007

Vendor app (written in VB '05) connects fine building screens that list data from only one record but blows up building 'list' screens that list multiple records. Really strange-it works fine when run locally on the server (Win2K3) and when run from one developer's machine (which has VS 2005 but not SQLExpress) but not from other developer's machines (which have both VS 2005 & SQLExpress) nor from a 'user' machine (which has neither). All have .Net Frameworks 2.0, the developer machines have SQL Management Studio & connect fine via that.

Vendor, of course, says it's a configuration issue so not their problem. I'm trying to figure out what they could be doing differently when building a list screen & therefore why it would fail. Fact that it works locally suggests that the failure is in the remote connection-but fact that it connects on 'single record' screens says that remote connections work. So what would be different about a request to return multiple records and why would it work locally but not remotely?

BTW, Surface Area Configuration Manager won't run-it reports 'localhost does not exist on the network or it cannot be configured remotely'. This is when running the Configuration tool directly on the server.

Any ideas?

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Very Strange Remote Connection Issues

Feb 28, 2008

Well this has got most of us stracthing our head as not matter what we do we can't connect remotely

But it get's a bit more complex. We have an existing web application running with a local instance of express running fine. However as the server is getting hammered we need to put the new version of the site on a second server. Unfortunately the key contact who use to work on the old system and set it up is no longer avialable. We've been through all the basics and nothing works... our latest attempt was to install a new instance of 2005 as we were not sure what was going on.

So, here is the log for this new clean instance:





Code Snippet

2008-02-28 15:12:13.75 spid5s Server name is 'S15271584SQLEXPRESS'. This is an informational message only. No user action is required.
2008-02-28 15:12:13.75 spid5s Starting up database 'msdb'.
2008-02-28 15:12:14.00 spid8s Clearing tempdb database.
2008-02-28 15:12:14.26 Server A self-generated certificate was successfully loaded for encryption.
2008-02-28 15:12:14.29 Server Server is listening on [ 'any' <ipv4> 4286].
2008-02-28 15:12:14.29 Server Server local connection provider is ready to accept connection on [ \.pipeSQLLocalSQLEXPRESS ].
2008-02-28 15:12:14.29 Server Server named pipe provider is ready to accept connection on [ \.pipeMSSQL$SQLEXPRESSsqlquery ].

The Browser is up and running and we try to connect via SQL Management Studio with the following details:

SERVERNAMESQLExpress
SQL Server Authentication

But get:





Code Snippet

TITLE: Connect to Server
------------------------------

Cannot connect to SERVERNAMESQLEXPRESS.

------------------------------
ADDITIONAL INFORMATION:

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. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=-1&LinkId=20476

------------------------------
BUTTONS:

OK
------------------------------


How do I know this is not a connectivity/firewall issue? Simple:

1. We stop the SQLExpress instance
2. Setup netcat to listen on that port (nc -l -p 4286)
3. Connect via telnet (telnet SERVERNAME 4286) and type something which then appears printed out on the other end.

Anyway, the Windows Firewall is off and I can't see any other firewalls installed (we did not setup this server).

Btw, if we try and connect to the existing instance we get:





Code Snippet

TITLE: Connect to Server
------------------------------

Cannot connect to www.a-t-s.net.

------------------------------
ADDITIONAL INFORMATION:

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. (provider: TCP Provider, error: 0 - A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.) (Microsoft SQL Server, Error: 10060)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=10060&LinkId=20476

------------------------------
BUTTONS:

OK
------------------------------

Here is the error log for that instance:






Code Snippet

2008-02-15 06:43:16.92 spid4s Server name is 'SERVERNAMES15271584'. This is an informational message only. No user action is required.
2008-02-15 06:43:16.92 spid4s Starting up database 'msdb'.
2008-02-15 06:43:17.14 spid8s Clearing tempdb database.
2008-02-15 06:43:17.19 Server A self-generated certificate was successfully loaded for encryption.
2008-02-15 06:43:17.20 Server Server is listening on [ 'any' <ipv4> 1177].
2008-02-15 06:43:17.20 Server Server is listening on [ 'any' <ipv4> 1433].
2008-02-15 06:43:17.31 Server Server local connection provider is ready to accept connection on [ \.pipeSQLLocalS15271584 ].
2008-02-15 06:43:17.31 Server Server named pipe provider is ready to accept connection on [ \.pipeMSSQL$S15271584sqlquery ].
2008-02-15 06:43:17.31 Server Dedicated administrator connection support was not started because it is not available on this edition of SQL Server. This is an informational message only. No user action is required.
2008-02-15 06:43:17.33 Server The SQL Network Interface library could not register the Service Principal Name (SPN) for the SQL Server service. Error: 0x54b. Failure to register an SPN may cause integrated authentication to fall back to NTLM instead of Kerberos. This is an informational message. Further action is only required if Kerberos authentication is required by authentication policies.
2008-02-15 06:43:17.33 Server SQL Server is now ready for client connections. This is an informational message; no user action is required.


We've also run a network sniff with wireshark and get see the request hitting SQL on the right port... but there is never a response back.

Any ideas? I'm open to anything short of slitting my wrists!!


Many thanks in advanced.

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Apr 22, 2007

I recently switched servers and I'm running into the a really strange remote connection issue.

The server is brand new Windows 2003 fully updated , .NET 2.0 and 3.0 installed, trying remote connection using VS2005 and the full edition of Management Studio. Managment Studio Express is installed on box.

Firewall is not blocking UDP port 1434 or TCP port 1433 or any other normal port, verified with Netstats

First I tried to install SQLExpress Advanced Services as a default instance. The install worked fine with no issues. I enabled remote connections in the surface area config tool and then restarted the service. When I attempted to connect using xx.xx.xx.xxx or xx.xx.xx.xxy on the local machine using TCP or NP with SQL authentication it worked fine. Then I tried to connect from my remote machine and I recieved one of these errors:

Using TCP

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. (provider: TCP Provider, error:0- A Connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.)


Using NP

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. (provider: Named Pipes Provider, error:40- Could not open a connection to SQL Server)


Next I contacted my hosting company they recommended that I reinstall which I did this time as a Named Instance did the remote configuration, started the sql browser and got the connections working on the local machine using

.SQLEXPRESS

or xx.xx.xx.xxxSQLEXPRESS or xx.xx.xx.xxySQLEXPRESS

Tried again from my remote machine get the

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.Error 26 (can't find a server at this address error)



Any suggestions??

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OK


Connection failed:


SQLState: '01000'


SQL Server Error: 10061


[Microsoft][ODBC SQL Server Driver][TCP/IP Sockets]ConnectionOpen


(Connect()).


Connection failed:


SQLState: '08001'


SQL Server Error: 17


[Microsoft][ODBC SQL Server Driver][TCP/IP Sockets]SQL Server does not


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I just did an netstat -an and I don't see the server listening on 1433.


What am I not doing?





The svrnetcn tool has no effect. I make a change and check the logs,


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------------------------------
Package Validation Error
------------------------------
ADDITIONAL INFORMATION:
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(Microsoft.DataTransformationServices.VsIntegration)
------------------------------
BUTTONS:
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------------------------------

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Any help appreciated



regards

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Hi guys,

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This is the error i get when i try and expand the server tree:

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Reason: SQL Server does not exist or access denied.

ConnectionOpen (Connect())..

Please verify SQL Server is running and check your SQL Server registration properties by clicking on [OurServerName] node) and try again.

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Situation
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Extra Info
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Endeavor
 
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------------------------------

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------------------------------
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Error:  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. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
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Jun 3, 2007

Hi,
I've worked with SQL Server plenty but never in this specific manner.  Hoping someone can shed some light.I have a webform on web server A that needs to talk to a SQL server database that web server B accesses via its web application. I do not haveany privelidged access to server B or the sql server it uses (no FTP to webserver, no remote access via Enterprise Manager to the SQL server).  The Admin of Server B told me that I can use a DSN connection to talk to the SQL server database that the web app on server B uses.  He emailed me the names of the SQL database tables AND a copy of the web.config from server B which shows the DSN implemented like this:<appSettings>    <add key="dsn" value="data source=sql3.domainname.net;database=dbname;User Id=dbuserid;password=dbpw;" />    <add key="default_language" value="en" />    <add key="error_email_to" value="someone@domainname.com" />    <add key="baseHref" value="http://www.mysite.com/" />    <add key="website_name" value="$$$$$$$$$$$$$$$$$" /></appSettings>
I was planning to run my webforms on Server A where I do have FTP, Control Panel, etc.So, I wrote this code into my VB.NET codebehind file.
Dim oODBCConnection As OdbcConnectionDim sConnString As String = _"Driver={SQL Server};" & _"Server=sql3.domainname.net;" & _"Database=dbname;" & _"Uid=dbuserid;" & _"Pwd=dbpw"oODBCConnection = New Odbc.OdbcConnection(sConnString)oODBCConnection.Open()... commands to access data and load something into a control on a webformoODBCConnection.Close()
When I attempt to run the webform in my browser from Server A. I'm getting this error:ERROR [08001] [Microsoft][ODBC SQL Server Driver][DBNETLIB]SQL Server does not exist or access denied. ERROR [01000] [Microsoft][ODBC SQL Server Driver][DBNETLIB]ConnectionOpen (Connect()).The error is EXACTLY the same whether I place the appSettings section in server A's web.config or leave them out.I have obvious questions about the error like...Might sql3.domainname.net simply be refusing communication requests that don't come from the Server B domain?Might the sql3.domainname.net be setup so that I need to use another protocol (not tcp/ip)?Might my code need to be changed to support this type of connection (i.e. I didn't code it right)?I spent some time reading http://support.microsoft.com/kb/328306/en-us but I'm at a loss as to what the best course is to take for debugging this.Thanks in advance for any insight you can offer.
Stewart

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