Ultimate Branding has a SMTP bug

SMTP module is not sending s test email. Showing "Sending a message, please wait..." forever. Getting this message in the debug,log:

SMTP ERROR: Failed to connect to server: No route to host (113) 2018-06-30 18:22:59 SMTP connect() failed.

https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

Same SMTP credentials working with other SMTP plugins