I am really desperate: I need to migrate a .NET 4.7.2 API to .NET 5.0.
In debug-mode on my local Windows 10 machine, everything works fine until I publish it on a Debian 10.9.
I configured and started nginx and when I try to send a GET, I get the following exception when connecting with Microsoft.Data.SqlClient to SQL Server 2008 R2:
Microsoft.Data.SqlClient.SqlException (0x80131904): A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: SSL Provider, error: 31 - Encryption(ssl/tls) handshake failed)
I tried to add
MinProtocol = TLSv1
CipherString = DEFAULT#SECLEVEL=1
to openssl.cnf (https://learn.microsoft.com/en-us/sql/connect/ado-net/sqlclient-troubleshooting-guide?view=sql-server-ver15#possible-reasons-and-solutions) without success.
I also tried to add HTTPSRedirect to my .NET 5.0 API, without success as well.
Does anybody know how to fix that problem?
Related
We have updated TLS 1.1 to 1.2 on application server where ASP.NET web application is hosted on IIS. The application is built with .Net framework 4.7.2. But after installing cipher on the application server, application unable to connect the SQL database (2014 SP3) and throwing the following error
A connection was successfully established with the server, but then an error occurred during the login process. (Provider: SSL Provider, error: 0 - One or more of the parameters passed to the function was invalid.)
If anyone has faced the same issue, please let us know here.
We have added extra parameter in connection string such as TrustServerCertificate=true, Enable the Named Pipes in SQL Server Configuration. But didn't work.
I recently upgraded to Entity Framework Core 7 in development and I'm getting an exception, "A connection was successfully established with the server, but then an error occurred during the login process. (provider: SSL Provider, error: 0 - The certificate chain was issued by an authority that is not trusted.)" I am using Microsoft SQL Server Developer (64-bit). I have tried to make changes in the VS2022 Server Explorer to disable encryption and to trust the server certificate, I don't have one installed, but the exception remains. How can this be mitigated in development?
it is not a bug in EF Core 7.0, instead it is improved security. Microsoft suggest following 3 solution, which ever applies to you.
install a valid certificate.
Add TrustServerCertificate=True to the connectionstring
Add Encrypt=False to the connectionstring
Old behavior
SqlClient connection strings use Encrypt=False by default. This allows connections on development machines where the local server does not have a valid certificate.
New behavior
SqlClient connection strings use Encrypt=True by default. This means that:
The server must be configured with a valid certificate
The client must trust this certificate
If these conditions are not met, then a SqlException will be thrown. For example:
A connection was successfully established with the server, but then an error occurred during the login process. (provider: SSL Provider, error: 0 - The certificate chain was issued by an authority that is not trusted.)
https://learn.microsoft.com/en-us/ef/core/what-is-new/ef-core-7.0/breaking-changes
Same problem here after upgrading Microsoft.EntityFrameworkCore.SqlServer to 7.0.0
I fixed that by adding TrustServerCertificate=Yes to the SQL Server connection string.
I think it's fails because is a recent update.
I had the same problem and I fixed it re installing the previous version (6.0.11).
I hope this comment helps you.
It seems the answer is to await an update to EF Core 7. This should be a bug. My development is all on one machine with a SQL Server Development Edition instance. I suppose using localdb might be an approach.
After adding Encrypt=False in the connection string it resolved the issue.
"DefaultConnection": "Server=(localdb)\\mssqllocaldb;Database=CommunicationDB;Trusted_Connection=True;MultipleActiveResultSets=True;Encrypt=False;"
Our application sometimes throws out this error:
System.Data.SqlClient.SqlException (0x80131904): A connection was
successfully established with the server, but then an error occurred
during the login process. (provider: SSL Provider, error: 0 - An
existing connection was forcibly closed by the remote host.) --->
System.ComponentModel.Win32Exception (10054): An existing connection
was forcibly closed by the remote host.
The application runs perfectly fine for some time, but just sometimes throws the exception above. Until now it is pretty hard to find the cause of this. Some say that it has to do with the amount of connections, but we have it set at zero and therefor it should be maximized at around 32k connections which we think we do not use.
EDIT: Seen the SSL provider is used and the client OS version is lower than the SQL server OS version I am thinking about the TLS version or cipher suite. I still cannot figure out why the same client is sometimes using a different/incompatible cipher suite or TLS version.
I had the same experience when my source os version was windows server 2016 and destination os was windows 2012, after windows update it happened, check windows recent updates.
I'm trying to connect to SQL Server from my .NET application.
I tried it on my pc and one other pc with already installed sql server.
I needed to test my app and I started virtual machines (windows 7 and 8.1).
I am constantly getting 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: Named
Pipes Provider, error: 40 - Could not open a connection to SQL
Server)"
I tried everything that i found on internet that might help.
Nothing works for me.
Im using VirtualBox for virtual machines.
Is there might problem with that or even problem is because I'm trying to do it on VM. How can I resolve this?
Check this is this helps go to run -> sql server configuration manager then check sql server service are running and then client protocol enabled
I have a Windows server 2008 R2 64 bit with a VMware instance of Informix Dynmic Server 11.50 virtual appliance 32bit running.
Using the default database server provided in the virtual appliance i have created a database and a table inside it.
I installed the Informix Client SDK 3.5 and the informix data server provider Drivers on the windows server.
I setup the server connection on the windows server using setnet tool.
I tested the connection with the connect test demo tool of the SDK and the query executed successfully.
Now when I am testing the .Net provider driver by running the testconn.40_32.exe with the following connection String:
testconn40_32.exe -dtc "Database=safdata; Server=192.168.154.128:9088; User ID=root; Password=root"
I get following error:
Unable to open socket to server:
ERROR [08001] [IBM] SQL30081N A communication error has been detected. Communic
ation protocol being used: "TCP/IP". Communication API being used: "SOCKETS".
Location where the error was detected: "192.168.154.128". Communication functio
n detecting the error: "recv". Protocol specific error code(s): "", "", "0".
SQLSTATE=08001
Have you tried both tests from the same machine? If not then maybe you cannot go through firewall or other network device.
If you run tests on the same machine the server works then instead of 192.168.154.128 use localhost or 127.0.0.1. You can also check if Informix listens on port 9088 using netstat command or tool like TCView or ProcessExplorer.
I uninstalled the client SDK and all other drivers.. re-installed only the client SDK and it worked. The client drivers were conflicting with other versions of the driver I had installed.