无法将 postgresql db 连接到我的 netcore Web 项目（DigitalOcean Cloud）

Question

I want to use my postgresql db from digital ocean in my webpage. Before i create this db, i have a free one for test and is working fine, but this new its not working. I can connect from pgadmin to the db without problem.

My web project is a net core 2.1.

My connection strings

• (1) From my test db (working):

optionsBuilder.UseNpgsql( "Server=my-server;Port=5432;Database=mydb; User Id=myuser;Password=mypsw;");

• (2) From digital ocean db (not working):

optionsBuilder.UseNpgsql("Server=myserver;Port=25060;Database=defaultdb; User Id=doadmin;Password=mypsw;SslMode=Require");

If i use the (1) connection it works perfect, but when i change to (2) connection throw me the error message. This is the error message:

“The remote certificate is invalid according to the validation procedure.”

My web its certificated with Let's Encrypt, certbot.

Tell me if you need more info.

Answer 1

I found the solution, my problem was the ssl certificate, letsencrypt its a self-signed certificate and with sslmode=require, the connection fail. So you have to add this parameter Trust Server Certificate=true .

optionsBuilder.UseNpgsql("Server=myserver;Port=25060;Database=defaultdb; User Id=doadmin;Password=mypsw;SslMode=Require;Trust Server Certificate=true");

Source: https://www.npgsql.org/doc/security.html#encryption-ssltls