What browser are you using? Type and version number?
Try another browser to rule out a browser issue. Make sure you have the latest version of your browser and that JavaScript is enabled and not blocked:
https://www.whatismybrowser.com/
If you are on a mobile phone and using the eBay app, your phone's default browser may be not recognized by eBay; try changing your default browser to another more common browser.
In some cases, if you are using a bad link and getting stuck in a redirection loop, you can get that error message.
If the problem happens when trying to sign in, see if you can use a different link to sign in.
https://signin.ebay.com/ws/eBayISAPI.dll
Are you using a VPN?
The issue may be related to your location or your network.
Are you able to sign in and search on other eBay sites such as ebay.com.au or ebay.co.uk?
