If the hardware has the State Online, the communication is working. Most of the time the Problem is located in the Microsoft Windows API.
Agent / Install error log shows following message:
registerPatchallService failed, exception: SSL Error: WINHTTP_CALLBACK_STATUS_FLAG_CERT_DATE_INVALID SLL certificate is expired.
Since it is a Windows 7 client, probably a root or intermediate certificate is missing in the certifcate store.
Please verify if the following certificates are installed on your Windows 7 machine:
Otherwise download and install the missing certificate from https://letsencrypt.org.