Your current IP address or network range is not included in the instance's IP Access Control List (ACL) configuration. (high likelihood)
Recent VPN connection changes have altered your public IP address to one outside the approved IP ranges. (high likelihood)
Network infrastructure changes such as datacenter migrations, ISP changes, or new proxy servers have changed your originating IP address. (medium likelihood)
IP Access Control is enabled but no IP ranges have been properly configured, blocking all access except from localhost. (medium likelihood)
ServiceNow is incorrectly detecting your IP address due to proxy headers or load balancer configuration issues. (low likelihood)