Suspicious activity detected – Form submission blocked

Why VPNs trigger “Suspicious Activity” in Forms

• IP Address Blacklists: Many form security features rely on IP reputation databases. VPNs often use shared IP addresses that might be blacklisted or previously used for spam.
• Geo-location Mismatch: Submissions coming from countries or regions different from the site’s typical visitors can be flagged, and VPNs can make it look like someone is submitting from anywhere in the world.
• Bot/Spam Detection: Anti-spam measures sometimes associate VPN or proxy IP ranges with automated spam bots.
• Token or Session Issues: VPN use can occasionally cause issues with browser cookies, tokens, or session validation, especially if the IP address changes during a session.

Other Common Triggers

• Submitting forms too quickly (like bots do)
• Using certain browser privacy plugins or incognito/private mode
• Disabled JavaScript or cookies
• Rapid, repeated submissions from the same device or IP

What can be done:

• Encourage regular browsing: Recommend users access the form without VPN or from a “regular” network if possible.