ODBC Driver 18 for SQL Server]SSL Provider: [error:1416F086]

I have the following error while trying to connect SQL Server: ```none [Microsoft][ODBC Driver 18 for SQL Server]SSL Provider: [error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:self signed certificate] ``` I'm on Ubuntu 20, PHP 7.4 FPM, nginx. ```none Server Microsoft SQL Server [11.00.3128 Microsoft SQL Server 2012 (SP1) - 11.0.3128.0 (X64) Dec 28 2012 20:23:12 Copyright (c) Microsoft Corporation Standard Edition (64-bit) on Windows NT 6.2 <X64> (Build 9200: ) (Hypervisor) ] ``` When I: ``` openssl s_client -connect myserverip:1433 -tls1 ``` I get: > CONNECTED(00000003) My openssl library version is: > OpenSSL 1.1.1f 31 Mar 2020 (Library: OpenSSL 1.1.1k 25 Mar 2021) I have tried many things, like forcing system to use TLS1 in /etc/ssl/openssl.cnf or nginx configuration to downgrade to tls1.