I recently disabled TLS 1.0 & TLS 1.1 on a web server, but it seems to have caused some issues with some of the PHP sites I'm running.
The error in question is: "[Microsoft][ODBC Driver 11 for SQL Server]Encryption not supported on the client." but I have other sites running on TLS 1.2 on the same server, I even have other PHP-based sites still able to connect to the database despite being earlier versions of PHP (5.3.28, which I think might've even been before TLS 1.2 support was added.. so not sure how they're still functional considering the server is now restricted to TLS 1.2 only).
Anyway, I've been troubleshooting this quite a while now, and would greatly appreciate any new ideas to try.
Server: Windows Server 2012 R2 Standard (IIS 8)
PHP Version: 7.0.17
curl version: 7.47.1
SSL version: OpenSSL/1.0.2h
The same sites have been able to connect to the databases in the past, just apparently not through TLS 1.2
If I can provide any other info here that would be useful, just let me know and I'll update the thread.
For an SSL connection failure,you may have to look into both sides (both the client and server side). Please check the sql server and verify if it with the help of this article on TLS 1.2
Also for the ODBC driver as well,you have to make sure all the components are updated.Refer this msdn .
There is also this powershell script which can be executed to figure out which drivers needs to be updated.