![]() ![]() Use MMS with the same snap-in choices and in Certificates > Trusted Root Certification Authorities right-click Certificates and select All Tasks > Import.Use default settings and save as a file.Select the new certificate, right-click, and select All Tasks > Export.Add the identity running SQL Server (look the identity up in Services if in doubt) with READ permission.Select the new certificate, right-click, and select All Tasks > Manage Private Keys (this step and the following is part of making the key work with SQL server).Browse to Certificates > Personal > Certificate. ![]() This probably doesn't work for a SQL Server self-generated certificate but if you used something like New-SelfSignedCertificate you can use MMC to export the certificate, then MMC on the client to import it. The quick-fix is to add Encrypt=False to your connection-strings.įor those who don't like the TrustServerCertificate=True answer, if you have sufficient access you can export the SQL Server certificate and install where you're trying to connect from. The change was made in this SqlClient pull-request in August 2021, where there is additional discussion about the change. In scenarios where client encryption libraries were disabled or unavailable, it was possible for unencrypted connections to be made when Encrypt was set to true or the server required encryption. Ensure connections fail when encryption is required With the growing use of cloud databases and the need to ensure those connections are secure, it's time for this backwards-compatibility-breaking change. The default value of the Encrypt connection setting has been changed from false to true. ![]() Breaking changes in 4.0 Changed Encrypt connection string property to be true by default. If you're getting this error after January 2022, possibly after migrating from to or just updating to version 4.0.0 or later, it's because MS has introduced a breaking change: I decided to add another answer, because this post pops-up as the first Google result for this error. You can read more on this topic in SQL Server books online under the topic of "Encryption Hierarchy", and "Using Encryption Without Validation". Don't forget to set it up to automatically refresh. ![]() Long term, I'd recommend leveraging Let's Encrypt to get a CA signed certificate from a known trusted CA for free, and install it on the VM. SQL Server will create a self-signed certificate if you don't install one for it to use, but it won't be trusted by the caller since it's not CA-signed, unless you tell the connection string to trust any server cert by default. If you have Encrypt=True in the connection string, either set that to off (not recommended), or add the following in the connection string ( also not recommended): TrustServerCertificate=True You likely don't have a CA signed certificate installed in your SQL VM's trusted root store. Please see also the other highly voted answers in this thread, including the one by From Jitbit below about a breaking change when migrating from to (spoiler: Encrypt is now set to true by default). 2022 Update - This answer (as comments point out) provides an explanation and stop gap, but also offers some better recommendations including purchasing and installing a proper cert (thanks to numerous community edits). ![]()
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