We have an older machine that hosts a bunch of test databases. It was working fine for years. One day a few months ago, we could no longer open SQL Admin on that machine. When you tried, you get the dreaded:
A network-related or instance-specific error occurred while
establishing a connection to SQL Server. The server was not found or
was not accessible. Verify that the instance name is correct and that
SQL Server is configured to allow remote connections. (provider: Named
Pipes Provider, error: 40 - Could not open a connection to SQL Server)
Note that we are running everything on this one machine. We are not trying to connect over the network from another machine. I tried variations on MS's page and on various SO threads on the topic:
the firewall is off
the server is running, as is the name service
it is configured for remote connections
we've rebooted it
Again, this was all working fine, and we changed nothing on that machine. I suppose a Win update may have occurred.
On a lark, today I tried making a new DSN to the same server, using SQL Client 11. It saw the server in the combo (took a while), and the test connection worked fine. But SQLSM still fails!
Does anyone know what connection type the Native Client would use, and what that driver uses to populate the server list?
My suspicion is that something is wrong with the named pipes service. If ODBC uses named pipes, then I'm a bit stumped.
Related
I have configured a SQL Server 2016 alias following this post and it was working, but suddenly it stopped working.
Error message:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - The wait operation timed out.) (.Net SqlClient Data Provider)
I created the alias using the SQL Server Configuration Manager and created it in the 32 and 64bit:
When I go to the Protocols for SQL Server Express, all of them are enabled, thus TCP/IP is enabled. Also, the SQL Server Browser service is running.
Looking at the system log there is no relevant message about it, so I'm a bit lost about what could be causing it to stop working. My OS is Windows 10 Pro.
Would you have any clues to help me solve it? Thanks for any help
Check that the SQLEXPRESS instance's port number hasn't changed, which is likely after a reboot or service restart.
Regarding the use of instance aliases, this is pretty much useless if you're also using dynamic ports for this very reason. To me it's more cumbersome to maintain this configuration than it is to maintain a connection string in your program IMHO.
I try to search my problem and found lots of threads, but all of them server related. All suggestion/tips regrading Database server related.
I have a database server (SQL Server 2014) hosted on VPS. Server is running fine without any issue, and working fine from all computer over internet. But from one PC it is not connecting. I disabled antivirus, added program on exception list on firewall,but still I am unable to connect the server, while that server are access from other PC. This PC connecting on internet through cable internet connection and operating system is Windows 7 Ultimate (I called service provider, and confirmed that they are not blocking/filtering any IP).
Thanks in advance.
Error Details:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
The title pretty much says it all, however let me tell you what I have researched.
I have verified that the following services ARE running ...
SQL Server (SQLEXPRESS)
SQL Server Browser
SQL Server VSS Writer
(I don't really know what this one does)
This one however will not start ... For some reason it starts then automatically turns off.
SQL Server Agent (SQLEXPRESS)
When I try to connect using my server_name\instance and Windows Authentication I get the following error ...
"A network-related or instance-specific error occurred while
establishing a connection to SQL Server. The server was not found or
was not accessible. Verify that the instance name is correct and that
SQL Server is configured to allow remote connections. (provider: SQL
Network Interfaces, error: 26 - Error Locating Server/Instance
Specified) (Microsoft SQL Server)"
The connection specified in the "Connect to Server" box was working perfectly fine before I upgraded. I thought it might have been my Norton 360 Premier but I uninstalled it and it didn't help. I AM having issues with the adapter frequently dropping the internet connection but I just disconnect and reconnect and that resolves itself ... perhaps it's related?
The other technique I tried was to replace the server name with the IP address ... 192.168.0.22\Instance ... This actually seemed to find the SQL Server but rejected the Windows Authentication ...
"Login failed. The login is from an untrusted domain and cannot be used with Windows authentication."
Any help getting this up and running would be greatly appreciated. I have several databases on here and would hate to have to reinstall SQL Server and manually hook them back up .. or worse lose any of them. I have a client waiting so ... the sooner I get help the MORE appreciative I'll be!!
Sincerely,
G
UPDATE
I have access! But I am not sure what I did that made the difference.
Open SQL Server Configuration Manager.
Expand SQL Native Client 11.0 Configuration (32-bit)
Select "Aliases"
Choose alias name ".\SQLEXPRESS"
Change alias name to "192.168.0.2\SQLEXPRESS" (using your IP address)
Change the value of "Server" to 192.168.0.2\SQLEXPRESS (using your IP address)
This allowed me to log on to the server using the ".\SQLEXPRESS" alias.
Some things I do NOT understand however is ...
I changed the "alias name" expecting that to appear in my list of connections drop down in SQL Management Studio. It did not, but the alias "'\SQLEXPRESS" was still there and worked!
For the alias "SERVER\SQLEXPRESS" I changed the "Server" value to use the IP address as well but received the authentication error described earlier, even though the only difference was the Alias Name.
I'm Trying to created a shared Data source from a sql server that is not local. the host of SSRS is a sql server 2014 and the DB source is a sql server 2008 R2.
I'm getting the same error whatever I do, which is
"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)"
I know everything is correct because even though I get this error when I run the report, in MSSQL report builder when I create a dataset and go to query designer and run the query it actually runs without any issues.
furthermore also in report builder when I try to do a connection embedded in my report and when I'm in the connection builder (connection properties) and I test the connection from there it gives me "the test connection suceeded" however when I click ok, go back to the datasource properties, and click "test Connection" it fails and gives me the error above.
If I try to test a shared connection on the server it will fail too.
I've tried connecting in many different ways (using windows athentication (my user is admin on the server), SQL server authenticationm, promting, etc) but they all failed.
I've been at this for a while, the server is also accesed by a remote PHP server so I doubt there is any real issue on the SQL server. I've tried deactivating all of the firewalls I saw but I doubt it's a firewall issue since I"m able to do all these connections.
the issue was the port 1433 that didn't work between the SSRS server and the datasource server. however it did work between my computer and the sql server.
what was happening is that when I tested the connections, the first test was a quick test and went through my computer to test the connection thus it was sucessfull. when it did the real test it went through the SSRS server and it failed there.
the same logic applies when I did my requests, when I tested the dataset it worked because in report builder it went directly to the database through my computer, when I tried to run the report it went through the SSRS server and failed there.
so there is some issue with the firewall even though it is turned of on both servers it's the connection between the two that isn't working.
I developed a .net application that depends on a sql server database, the database was on the local machine used for development of the application.
When I moved the database to a remote machine and changed the connection string I got the following 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 default settings SQL server does not allow remote connection. ( provider: Named Pipes Provider, error: 40 – could not open a connection to SQL server. )
This error occurs only from XP machines but it works fine from Win. 7 Machines with the same connection string:
connectionString="Data Source=ot;Initial Catalog=sp_warehouse;User ID=fu;Password=bar"
I tried the following to troubleshoot the problem:
- Disabled Named Pipes service from the server.
- Added an exception in the server firewall for the SQL Server port 1433
- Disabled the firewall on the server completely
- Added this parameter in the connection string: Network Library=DBMSSOCN;Persist Security Info=True
Each time I try something I get the same result, win. 7 machines work fine but XP machines don't.
Note: There's another application works from XP machines that uses another database on the same SQL Server and it's working fine.
Make sure the SQL Browser is enabled and running on your remote machine. You'll probably want to leave named pipes enabled.