I have a C# console application which is using Snowflake .NET connector to connect with Snowflake DB. Application is working fine on my system however if I take that application to EC2 and execute then it's not connecting to Showflake DB with giving error "SnowflakeDbException: Request reach its timeout".

Network connectivity between AWS EC2 instance and Snowflake DB is in place.

Below is the code that I'm using:

static void Main(string[] args)
    {
        try
        {
            using (IDbConnection conn = new SnowflakeDbConnection())
            {
                conn.ConnectionString = "scheme=https;account=<accountname>;port=443;user=. 
               <xxxxxx>;password=<xxxxxx>;ROLE=<definedRole>;warehouse=<warehouse>;db=
                <DBNAME>;schema=<schemaname>";

                conn.Open();  //ERROR: "SnowflakeDbException: Request reach its timeout"

                Console.WriteLine("Connection successful!");
                using (IDbCommand cmd = conn.CreateCommand())
                {
                    cmd.CommandText = "select * from TABLE1";  
                    //data from an existing table
                    IDataReader reader = cmd.ExecuteReader();
                    while (reader.Read())
                    {
                        Console.WriteLine(reader.GetString(0));
                    }
                    conn.Close();
                }
            }
        }
        catch (DbException exc)
        {
            Console.WriteLine("Error Message: {0}", exc.Message);
        }
    }

If I do 'Test-NetConnection' command using powershell as below then it is succeeded.

Test-NetConnection -computerName xxxx.eu-west-1.privatelink.snowflakecomputing.com -port 443

Result: TCPTestSucceeded : True

StackTrace Error Image

Trace post enabling Logging

System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. ---> System.Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure.

cURL output

SnowCD output

CodePudding user response：

You are failing the CRL check. Setting the parameter INSECUREMODE=true will disable the certificate revocation list check and test should pass, but this is not recommended in a production system.