Scan for exposed ports that are open to the internet. Use a tool like Nessus to scan your external IP address ranges to review what is now open. Make sure only authorized remote-access tools are being used. Review log files for any abnormal connections, particularly for outbound VPNs used as a reverse tunnel for access. Check for unauthorized deployments of TeamViewer, GotoMyPC or LogMeIn that open your firm to more access than you intended. Review firewall configurations and pay attention to any changes in the configuration youve made in the last few weeks.”]
Source: https://www.csoonline.com/article/3538968/how-to-check-your-windows-network-for-vulnerabilities.html