Why is mailer yii2 not working?

Question

Yii

When sending a message to email on a virtual server, an error occurs:
Connection could not be established with host smtp.mail.ru [Network is unreachable #101]
While everything works on the local server.

Answer 1

Translation:

Failed to connect to host smtp.mail.ru [Network unreachable #101]

do not thank for the translation)
If you do not understand Russian, then it says here that you have either provided incorrect data for connecting to smtp.mail.ru, or the server is not available. Check connection settings.