We are going to deploy the new yiiframework.com website on March 23, 2018 from 8:00 to 12:00 UTC.
Website and Yii documentation will not be available in this time frame. Check the news for more details.
This tutorial describes how to connect to a remote service via tunnel when only most basic software is available on the remote server. It is not directly related to Yii. It could be hovewer useful for web developers working with shared hosting sites with limited access.