Windows 10: Problem with client connections to SQL Server 2019 after installing KB5020695

We have a serious issue with connections to a SQL server 2019 instance. On all clients that have installed the update: KB5020695 or the equivalent for the other operating systems, the applications fail during sql read/ write giving unrecoverable errors. All clients without the update are fine, and the clients that are now failing were ok before installing the update. Anyone any ideas as to how to overcome the problem?The text of the KB states: This security update addresses a vulnerability which exists in System.Data.SqlClient and Microsoft.Data.SqlClient libraries where a timeout occurring

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Is evaluation version of SQL Server 2019 same as Standard Edition?

We need to prepare environment to test some app. It should be similar to our clients environment and he uses SQL Server Standard 2019. Can evaluation edition of sql server 2019 be used on our environment, cause we don't want to pay for additional sql server standard instance.

 

SQL Server remote connection fails

I'm trying to install SharePoint 2019 and the remote connection to my SQL Server is failing. I've set up the firewall rules on SQL Server, allowed TCP and UDP ports 1433 and 1434 and have allowed the sqlservr.exe program in the inbound rules.

The user that's being used in the SP install wizard is an active AD domain user. I can ping the server by IP address and by name but it seems that SQL Server never receives the connection attempt.

As a test I set up a .udl file on the SharePoint host and tried to connect to the SQL Server and the connection still failed. It's not just the SP installer but something is preventing connections to SQL. I've searched the web and tried every tutorial and
suggestion but it's still failing.

Is there anything else I can check? This should not be as difficult as it has been and I'm wondering if something else is preventing the connection.

I appreciate any help.