Anki syncing error 400 url ()

For the past few months, every time I try to sync my anki it takes about 3 mins and shows an error message reading “Error details: HTTP status client error (400 Bad Request) for url ()”. I would like to purchase the anki app for my phone but do not want to do so until I get the syncing issue resolved due to fear of not being able to sync to my phone. Please help me fix this error! ( I am not great at using anki so any help will be very much appreciated)

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Check your firewall :slight_smile:

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I would like to purchase the anki app for my phone

FYI AnkiApp is not part of the Anki ecosystem - Frequently Asked Questions

I have actually been having this same problem too! What is a firewall?

Firewall “avoid” an enemy to access your computer and control it.

please, check here.
https://faqs.ankiweb.net/error-establishing-a-secure-connection-when-syncing.html

Please start by following the steps on When problems occur - Frequently Asked Questions