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itbabe

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When I connect to an open network, I get the below message

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Ramin

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first check if you have two things:

1. If your system is up to date especially for the latest certificates.

2. If you are using an unknown DNS server. If the DNS is polluted, it might point your well-known servers to incorrect IPs at where malicious certificates may be deployed.
One other thing to check that can invalidate a certificate.  

Ensure the date and time on your computer is correct.  

Otherwise it sounds like you may be connecting to a rogue wifi network.  

Don't use it.  Any communications could be compromised