From the error message in the tiny screenshot:
The driver could not establish a secure connection to SQL Server by using SSL [...] "SQL Server returned an incomplete response"
From your connection string:
The first thing would be to allow encryption. The second thing is look at the SQL Server errorlog and configuration to see if it's forcing encryption (though a different error message should have appeared). The third is get a packet capture to make sure the SSL 3-way handshake it happening and that it is indeed responding to requests.