How to solve the "406 not acceptable" error when trying to open Webflow?
TL;DR
- Clear browser cache and cookies, test in incognito mode or a different browser to rule out browser-related issues.
- Disable extensions and inspect request headers for overly restrictive settings.
- Turn off VPNs or proxies, switch networks to bypass potential filtering or regional restrictions.
- Use tools like curl or Postman to confirm if the issue is browser-specific.
- Contact Webflow Support with error details if the issue continues.
A “406 Not Acceptable” error typically occurs when the server cannot serve a response that matches the request’s "Accept" headers. In Webflow, this is rare and usually results from browser issues, network-level filters, or regional hosting conflicts.
1. Clear Browser Cache and Cookies
- Go to your browser’s settings and clear cached images/files and cookies.
- Restart the browser and try accessing Webflow again.
- Test in Incognito/Private mode or a different browser to isolate the issue.
2. Check Browser Headers or Extensions
- Disable browser extensions, especially those related to privacy, ad-blocking, or developer tools.
- Ensure your browser is not sending overly restrictive "Accept" headers (you can inspect this in Developer Tools → Network tab).
- Testing in a fresh browser can help determine if an extension is the cause.
3. Bypass Network Filters (VPN, Firewall, or ISP)
- If you're using a VPN or proxy, turn it off and try again. Some VPNs alter request headers.
- Switch to a different Wi-Fi or mobile network to test if your ISP or router is blocking certain content types.
- In some countries or networks, Webflow may be partially restricted—using a secure VPN may help in that case.
4. Check Server Response with Curl or Request Tool
- Use a tool like curl or Postman to check Webflow’s response. If the request fails only via browser, it's likely client-side.
- Focus on request headers like
Accept,User-Agent, or regional content restrictions.
5. Contact Webflow Support if Persistent
- If you're certain it's not local (browser, network, or region), reach out to Webflow Customer Support.
- Provide details like:
- Exact error text
- Browser and OS version
- Screenshots or request headers (from Developer Tools)
Summary
To fix a 406 Not Acceptable error in Webflow, clear your browser cache, disable extensions, check for network filters (like VPNs or ISP restrictions), and test with alternate browsers. If issues persist, contact Webflow Support with detailed technical info.