Users need to communicate with the Treasure Data site through Proxy servers, which return an invalid(mostly self-signed) certificate to the td toolbelt.
Unfortunately, td toolbelt does not have options to disable certificate verification. So users need to implement some tricks in scripts.
Error messages
Error: SSL_connect returned=1 errno=0 state=error: certificate verify failed
Implementing that kind of option(disabling certificate verification) for those users is better.