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Unable to log in to Fidelity.com - Firefox says "Performing TLS handshake . . ."

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When I try to log in to Fidelity.com using Firefox, there is a very long delay (until timeout), while the status bar at the bottom of the screen says "Performing TLS handshake . . ." This does not happen on other websites. Does anyone else have this problem, or any suggested solution?

When I try to log in to Fidelity.com using Firefox, there is a very long delay (until timeout), while the status bar at the bottom of the screen says "Performing TLS handshake . . ." This does not happen on other websites. Does anyone else have this problem, or any suggested solution?

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Try again with Firefox in Safe Mode and see if you have the same issue.

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That didn't help (yes, I still have the same issue). To save time, none of the following helped either:

Creating a new profile Reinstalling Firefox Restarting my modem and router

I've been using Firefox for several years and never had this issue before. I think it must be a bug in the new release - the problem began about the same time as the latest release.

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You can try to disable IPv6 to see if that has effect.

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What security software are you running? Are you Win 11 Pro? If so, try Windows Sandbox. https://www.howtogeek.com/399290/how-to-use-windows-10s-new-sandbox-to-safely-test-apps/

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Sorry for delayed response. The problem seems to have solved itself before I got a chance to try either of the preceding recommendations. Will report back if it reappears. All good for now, except I don't understand what caused the problem, or what resolved it.