Hi there!
The error you provided is a bit misleading (we're working to make it more clear).
The important part of the meessage is this: Details: Unable to connect to the remote server. This means that there is no network connectivity from your Agent to the SaaS controller. If SSL negotiation was the issue, you'd see an error message that looked like this "The remote certificate is invalid according to the validation procedure." The majority of customers won't need any special SSL configuration because most up to date Windows servers trust Digicert as a Certificate Authority by default.
That said, to troubleshoot this, please verify that you can access your controller using the same address/port using Internet Explorer from the server that the agent is installed on. If this works, it's very likely the Web Browser on your server is using a Proxy which will need to be added in the Agent Configuration Wizard so that the agent can use it as well. If this doesn't work, you'll need to talk to your Network team to ensure there is network connectivity from the Agent server to the Controller.
I hope this helps!
Thanks,
Matt