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network certificates problem

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First of all I want to say that I know just a few things about it and networking.
The problem: a few days ago the internet provider changed the the way we receive the signal. I think it is a fiber optics rooter (Huawei echolife hg 8245h, and next to it there is a yellow cable loop) . From this, there is a ftp cable that goes into a whireless rooter tp link tl wr 940n . After it it s the whole network of switches, computers and printers. The issue is that on all the computers and on all browsers we cannot access any sites, at the input of the internet addresses we get : edge: DL-FLAGS-INVALID-CA-DLGFLAGSSEC-CERT-CN-INVALID (this site is not secure...)
Similar messages appear on mobile devices using chrome or safari.
The outlook email works fine. Banking mobile apps on iOS dont even start.
Pinging google.com 0%loss, maximum 297ms, minimum 297ms, TTL=45.
Hope somebody can share some light.
Thank you!

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