ClientOptions().SetHost("hostname") throws an exception

[DKGH]

I ran the sample program listed on the README.md tutorial. However, it throws a system_error exception at line 409 in client.cpp. This is mitigated by entering the right port. Now the exception comes after a long wait and it says operation successful:
can't recieve string data: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

I would like to connect to a database and run some select queries on it. How do I do that? I have database host machine name and port, user name, password and table name.

[DKGH]

This appears to be related to SSL verification within my organization. How do I disable that?

[Enmk]

Hi @DKGH! It looks like you are either trying to connect to SSL port with as a non-ssl client, or vice versa.

to configure a non-ssl connection

auto client_options = ClientOptions()
        .SetHost(server_hostname)
        .SetPort(server_port) // typically  9000
        .SetUser(user_name) // optional
        .SetPassword(password) // optional
        .SetDefaultDatabase(database_name); // optional

to configure an ssl connection:

// almost the same as above, but make sure that you are using correct PORT
auto client_options = ClientOptions()
        .SetHost(server_hostname)
        .SetPort(server_port) // typically  9440 <<<=================!!!!! HERE
        .SetUser(user_name) // optional
        .SetPassword(password) // optional
        .SetDefaultDatabase(database_name); // optional

client_options.SetSSLOptions(
        ClientOptions::SSLOptions()
                    .SetUseDefaultCALocations(true)
                    .SetMaxProtocolVersion(SSL3_VERSION));

And then (regardless of how you've initialized ClientOptions instance, create a client:

auto client_ = std::make_unique<Client>(client_options);

[Enmk]

For configuring SSL connection there is a TON of options:
https://github.com/ClickHouse/clickhouse-cpp/blob/master/clickhouse/client.h#L138

But if you have a example that produces proper SSL_CTX*, perhaps it would be easiest to use just that:

clickhouse-cpp/clickhouse/client.h

Line 152 in 2a49a25

SSL_CTX * ssl_context = nullptr;

Please note that this is a CLIENT context, not a SERVER context