Log Mobile Admin:
Socket Connect Exception The handshake failed due to an unexpected packet format
Port 4055
Port TCP alter.
In use.
Resolved.
this port is released in the firewall if there is one? maybe this hel p you Mobile Admin_Security.pdf
No firewall.
Connection Test made the internal network https: // IP: 4055 and does not open.
When I tried to access http: // IP: 4054 functions normally.
you can run wireshark for test package.
Is no problem connecting to the server.
It is displayed in the error log of the Mobile Admin server.
It is also presented ssl error in the browser.
See this link´s SolarWinds Knowledge Base :: What ports does Mobile Admin use? or
SSL/TLS, The handshake failed due to an unexpected packet format. Mercury for Win32. POP3
https://github.com/jstedfast/MailKit/issues/131