Unusual SqlException when initiating connection to SQL Server

Question

I have a number of customers who can connect to our database without problems. One of our customers had to install our program fresh after he received a new computer and he's not able to successfully connect.

The connection process involves a stored procedure which checks a username, password and some other details and returns true if that user is allowed to use the database. The call to the stored procedure is where it goes wrong.

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 - Das Format der empfangenen Nachricht war unerwartet oder fehlerhaft.)

That last bit is in German - it translates to

The format of the message received was unexpected or incorrect.

I've snipped the rest since it's long. Here's the rest as an image. Sorry - I don't have it as text.

I've already tried

• having the user restart his machine
• restarting the SQL server
• checking that TCP/IP, named pipes and shared memory are enabled on SQL server

SQL Server version info:

Microsoft SQL Server 2008 R2 (SP2) - 10.50.4000.0 (X64) Jun 28 2012 08:36:30 Copyright (c) Microsoft Corporation Express Edition with Advanced Services (64-bit) on Windows NT 6.2 (Build 9200: )

Everyone else seems to have no problems connecting as usual, but it's just this one customer.

Now, one thing that's odd is it states the provider is 'SSL Provider'. As far as I know, I'm not using SSL. Could the client think it's SSL when it's not, and that's causing unexpected data?

I'm running out of things to try - any ideas how I should proceed in troubleshooting?

Answer 1

这是.Net Framework 4.5.1中的已知错误.NET Framework 4.5.1中断了与SQL Server的ADO.NET连接您可以通过安装.Net Framework 4.5.2来解决此问题