Please double-check your internet connection. Also, check that the link you are is correct. You can log on to TurboTax from our main website, or from the TurboTax Online 2021 Sign In page.
You can also clear your browser cache (or use a different browser) and try again. This TurboTax FAQ has instructions on how to clear the cache in several popular browsers: How do I clear my cache (browsing history)?
If you are still not able to resolve this issue, please contact our phone support team for more help.
Thank you for choosing TurboTax.