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Cannot connect to TZ-215 Sonicwall appliance with web browser!

Cannot connect to TZ-215 Sonicwall appliance with web browser!

Cannot connect to TZ-215 Sonicwall appliance with web browser!

We have a client with a TZ-215 appliance. We cannot connect any longer. Something about security. We tried with Internet Explorer 11 and we can get the "warning: " page about security. When we click to go, anyway, we get an error: res://ieframe.dll/ page cannot be found.

I believe we need to update the SSL certificate for this appliance (i think the firmware upgrade will do this) but how can I update firmware if I cannot connect to the appliance because browsers won't allow me to?

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