How to Fix Microsoft SQL Server Error 233?

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Users get the Microsoft SQL Server error 233 when logging into an existing database. It develops for various factors, such as going over the connection limit or firewall limitations. Even after entering the correct login information, users frequently report being unable to connect to an existing database.

Microsoft SQL Server

By using minor modifications, we can resolve users’ errors when authenticating to Microsoft SQL Server.

How to Fix Microsoft SQL Server Error 233? 

The following options in SQL Configuration Manager can be checked and enabled as one of the potential solutions to SQL server error 233, as will be detailed below.

Fix Microsoft SQL server error 233

Not configured for Mixed mode on Microsoft SQL server

Administrators can utilize their username and password separately following a specific procedure. You can also use the login and password for SQL servers with the aid of mixed mode. The option may occasionally be deactivated, which results in the Microsoft SQL Server 233 error.

By attempting to connect to SQL Server Management Studio with the System administrator account, you can determine what led to this issue.

Log in to SQL Server Management Studio> then server right click>then click on properties>then click on security>Change Windows Authentication Mode from SQL Server to Windows Authentication>then ok>then click on restart.

TCP/IP protocol disabled

Here, you should activate TCP/IP by following the steps below:-

Go to Microsoft SQL Server>then look for configuration tools so that you may choose both SQL Server Configuration Manager and SQL Server Network Configuration>then click on TCP/IP to enable it.

Shared memory protocol disabled

Users widely use shared Memory Protocols to connect to SQL Server instances. There will always be an authentication error if SMP is disabled.

Microsoft SQL Server Error

In this case, we need to enable SMP by following the steps.

Go to MS SQL Server>then configuration tools>then choose SQL server network configuration>then click on shared memory>then click on enable.

Disable of named pipes protocol

Named pipers protocols ensure a local area network’s excellent connection. Moreover, memory assists in the transmission of information from one area to another. You will encounter a problem if you deactivate Named Pipes Protocol. So we have to Enable Named Pipes Protocol to fix it.

Go to the SQL Server configuration manager>, click on SQL Server network configuration>, click on named pipes protocol>, and click on enable.

Disable of virtual interface adapter

Users face a Microsoft SQL server error 233 when the virtual interface adaptor is disabled. So to fix this issue, we have to enable the virtual interface adapter.

Go to the SQL Server configuration manager>, click on SQL Server network configuration>, and click on enable virtual interface adapter.

Viewport in Windows firewall

To achieve robust connectivity, we have to alter the viewport.

Open the Control Panel of your system>click on Windows Firewall>then Settings> then click on Exception>select add port> a window appears now fill up the port number> then click ok>then click on enable SQL.

Check for remote connection

To connect to the SQL server remotely, a remote connection is essential. As a result, it might cause Microsoft SQL server error 233 on a remote connection. Please do the following steps to make it enabled.

Error connection

Click on server node>choose properties> Select Connection (Left Tab)>then click the option ‘Allow remote connections to this server.’

Overcoming the Limit for Connections

A connection number will appear as 32767. To create a new connection and increase the number of connections, set it to 0. There is no restriction against using an existing link now that you have established a new one. Both the latest and the current relationship may be used at once. This is a short-term solution for exceeding the connection number limit. For a permanent solution, follow the below steps. 

Go to the SQL Server management studio>click on SQL Server Instance>click on properties> Change in Server-level> Select connection tab> Increase connection number limit>then restart.

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