I'm trying to setup a startup template to play around with boilerplate and see what it could potentially offer and I'm running into issues setting up my local database.
I've tried the core startup template download as well as MVC 5 and they've both given me the same issue so far. I'll open up the solution in VS 2017, clean the solution, rebuild, enter Package Manager Console and execute Update-Database on the EntityFramework project and I get this error on both projects,
ClientConnectionId:00000000-0000-0000-0000-000000000000
Error Number:2,State:0,Class:20
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)
I'm having a hard time understanding what this might be indicating. I'm pretty sure I've been able to use my local db in other projects recently.
You need to set up an empty database and provide a valid connection string in appsettings.json.
You can use Microsoft's SQL Server.
Related
Using the basic SqlConnection code below, I have discovered that, at my workstation, I am unable to connect to our Sql Server 2017 deployment via ASP.NET C# code in any given type of Windows-based project, such as Winforms (.NET Framework or Core) or Console apps. However, this code will run without incident in any Web-based project, such as Web Forms or MVC, either using .NET Framework or Core.
protected void testConnection()
{
string con = "Server=MySqlServer;database=MyDatabase;Integrated Security=true";
using (SqlConnection cnn = new SqlConnection(con))
{
cnn.Open();
cnn.Close();
}
}
In a web project, this code runs. In a Windows project, I get this error:
System.Data.SqlClient.SqlException: '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)'
In investigating this problem, I have tried the following:
Explicitly declaring the domain on which my SQL server is found (eg. MySqlServer.domain.com). No good.
Explicitly declaring the SQL Server port number, according to the example shown on connectionstrings.com (eg. MySqlServer, 1433). We do use the standard port number, for the record. No good.
Changing the protection level of the test method (protected/private/public). No good.
Connecting to the SQL Server in PowerShell. This connection worked.
Pinging in the SQL Server in a command prompt. The server responded in 1ms consistently.
I have asked other users on this network to test this code in a Winforms project on their workstations. No one is able to reproduce my issue.
Consulted my sysadmin. He is so far not able to find any reason why I should be having this issue.
The only difference I have noticed in all of this is that, when I declare the port number, the Inner Exception returned with the error reads "Win32Exception: A non-recoverable error occurred during a database lookup". Otherwise, it simply reads "Access is Denied."
All of this tells me that the issue is obviously something peculiar to my workstation, but I have no idea what, apart from some firewall or other local security setting that the sysadmin neglected to check. Has anyone encountered this problem?
My VS 2019 installation is only one revision out of date as of this writing, 16.8.3 as opposed to 16.8.4. I am able to connect to and run TSQL code on any database I care to via SSMS. We connect using Windows Authentication. According to the results of "select ##version", our version of SQL Server is 2017, 14.0.3356.20 (x64).
Any insight is appreciated.
We fixed it by forcing Named Pipes to be enabled in SQL Server, as opposed to using the default setting.
I am remotely debugging my application with azure and VS2019 and it works fine until I have to connect to the database.
Then I get the following error. "The underlying provider failed on Open."
On the other hand, if I debug locally everything works correctly.
Do you have to activate any permission in Azure or in the project config so that the database can be accessed remotely?
Right after the connection string I have put the following.
_context.Database.Connection.Open ();
So it returns the following error to me:
"Unable to connect to any of the specified MySQL hosts".
All this locally does not happen to me. Only when trying to debug remotely.
According to your description, we can ensure that the remote debug function of vs2019 is normal. An error is reported in this _context.Database.Connection.Open (); code. Obviously, the program cannot connect to the mysql database server.
Troubleshooting:
First make sure that your mysql database server can be accessed using tools (such as Mysql Workbench).
Using tools to ensure that the database is accessible is to ensure that the firewall of your database server is open (mysql in azure or other server).
Check the connectionstring of mysql in the released program. According to your error message, it is likely that the connection string is used incorrectly.
I'm trying to connect to an SQL database hosted on Azure from a function app I'm building in Visual Studio but I'm getting 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: TCP
Provider, error: 0 - An attempt was made to access a socket in a way
forbidden by its access permissions.)
I can connect from the same PC using SSMS without a problem. I've tried connecting to the database using data connections in server explorer in VS but I'm getting the same error. If I connect to Azure with my account in server explorer it shows me a selection of services including SQL databases but there are none listed underneath although my account does have access to the database.
Are there any hidden gotchas I'm missing or settings within VS? I've also tried adding my client IP in the firewall settings but that didn't make a difference either.
After doing some more testing it turned out to be the client firewall that was blocking VS and VS Code from connecting to Azure SQL. It seems there was already an exception for SSMS.
The error message states "Verify that the instance name is correct"
It could be that the SSMS is automatically creating a fully qualified name once you say that it is an azure database.
If you use the short name from Visual Studio, then you cannot connect to the SQL server.
For example "myserver.database.windows.net" versus "myserver".
I am trying to deploy my webapp VS2015 RC1 DNX 451. Even when I validate connection and run publish I get error
Severity Code Description Project File
Error Error Code: ERROR_USER_UNAUTHORIZED
Error More Information: Connected to the remote computer ("crocus.arvixe.com") using the Web Management Service, but could not authorize. Make sure that you are using the correct user name and password, that the site you are connecting to exists, and that the credentials represent a user who has permissions to access the site. Learn more at: http://go.microsoft.com/fwlink/?LinkId=221672#ERROR_USER_UNAUTHORIZED.
Error Error: The remote server returned an error: (401) Unauthorized.
Googling the issue and even trying to view host forum just says make sure username and password is correct. I am getting nowhere trying various settings. Any ideas how to debug the issue?
I am using Arvixe.com as host.
You should contact Arvixe.com. They likely have some odd configuration on their servers but I would suspect they can help you resolve the issue.
Arvixe does not support Web Deploy anymore. Once they move you to their new servers Web Deploy won't be available to you. In Visual Studio you can set up a Publish with FTP instead of Web Deploy. If you're used to Web Deploy publishing your database changes, then you'll need to do those yourself with SQL scripts. Entity Frameworks has an option to produce a SQL script for a migration, so you can use that to publish your EF database changes.
I have a web application that uses a local SQL Server Express database (a.k.a. ~/App_Data/ASPNETDB.MDF).
When I deploy to IIS 7.0 on Windows 2008 Standard (SP2), I get the 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)
The error message goes on to offer some advice
SQLExpress database file auto-creation error:
The connection string specifies a local Sql Server Express instance
using a database location within the application's App_Data directory.
The provider attempted to automatically create the application
services database because the provider determined that the database
does not exist. The following configuration requirements are necessary
to successfully check for existence of the application services
database and automatically create the application services database:
If the application is running on either Windows 7 or Windows Server
2008R2, special configuration steps are necessary to enable
automatic creation of the provider database. Additional information
is available at: http://go.microsoft.com/fwlink/?LinkId=160102. If
the application's App_Data directory does not already exist, the web
server account must have read and write access to the application's
directory. This is necessary because the web server account will
automatically create the App_Data directory if it does not already
exist.
If the application's App_Data directory already exists, the web
server account only requires read and write access to the
application's App_Data directory. This is necessary because the web
server account will attempt to verify that the Sql Server Express
database already exists within the application's App_Data directory.
Revoking read access on the App_Data directory from the web server
account will prevent the provider from correctly determining if the
Sql Server Express database already exists. This will cause an error
when the provider attempts to create a duplicate of an already
existing database. Write access is required because the web server
account's credentials are used when creating the new database.
Sql Server Express must be installed on the machine.
The process identity for the web server account must have a local user profile. See the readme document for details on how to create a
local user profile for both machine and domain accounts.
I don't understand how to troubleshoot 4. (where can I find the "readme document"?). However, the other items look correct to me.
Specifically...
The app pool in question is running as NETWORK SERVICE (not Application Pool Identity)
The user NETWORK SERVICE has Full Control of App_Data (do I understand correctly that it does NOT need Read/Write for App_Data's parent, since App_Data is already created?)
Interestingly, if I copy ASPNETDB.MDF and ASPNETDB.LDF from my development machine to the production App_Data, the error changes:
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) Description: An unhandled exception occurred during the
execution of the current web request. Please review the stack trace
for more information about the error and where it originated in the
code.
Exception Details: System.Data.SqlClient.SqlException: 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)
What am I missing?
I had the same error before and the problem was that my SQL Server service was stopped, this is pretty weird but sometimes they just crash,I had to reinstall SQL Server cause the service didn't even alloud me to start it,so you may want to check this.
I ended up moving the relevant tables to a new SQL Server database because I could not resolve the permissions issue.
That is the recommended approach anyhow for a production application, though it seems unfortunate that it was so hard (in terms of determining how to configure security) to deploy the ASPNETDB.MDF variant for a very low-volume website.