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Access denied

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I've used Metronomeonline.com for years on Firefox. Suddenly I'm getting screens when I access the website telling me "Secure Connection Failed" and the site won't open. Next day it'll be fine but that evening the same block will appear. When I access the site on Chrome there's no problem at all. Can you help me?

I've used Metronomeonline.com for years on Firefox. Suddenly I'm getting screens when I access the website telling me "Secure Connection Failed" and the site won't open. Next day it'll be fine but that evening the same block will appear. When I access the site on Chrome there's no problem at all. Can you help me?
Iqhotyoshelwe imifanekiso ekwisikrini

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This error means that the certificate for this server has been revoked.

Firefox seems to be the only browser that does the revocation (CRL) check in real-time, other browsers appear to download/update this CRL list from time to time and there it can take a few days before they are aware of a certificate revocation.

The website will have to acquire a new certificate. A similar recent report:

  • /questions/1369518 firefox blocked my auto payment site, had to use Chrome to pay my bill!!