CEM Agent can`t register to NS server

Hi,

Agent was installed with offline CEM package can`t register in Notification server.

Client machine is located outside our corporate network.

In client logs there is a message:

Request 'HTTPS://SMP-Server.com:443/altiris/NS/Agent/ConnectionTest.asp' failed, COM error: HTTP status 400: The server cannot process the request because the syntax is not valid (0x8FA10190)

I can`t find any solution for that kind of issue.