"Cannot verify server identity" iPhone 4S on home wifi. I get this message on mail, safari, iCloud...

For the past few days every time my iPhone needs to load something, it will take a ridiculously long time to load if it loads at all. This includes loading email, iCloud settings, iTunes, safari pages, even apps that need an Internet connection. Starting this morning I get these errors. I get this error when I check my mail, try to surf on Safari, check my iCloud settings or open my Facebook app. When I open iTunes I get this message: "The certificate for this server is invalid. You might be connecting to a server that is pretending to be 'itunes.apple.com' which could put your confidential information at risk."
I have tried shutting down my phone and turning it back on. I have also tried resetting all network settings.
I have switched to 3G and get the same above message from iTunes.
The 'cannot verify...' message has disappeared though. Multiple pages in Safari load just fine. I open Mail and get this message: 'cannot load mail, connection to the server failed.' My Facebook app will load and load and will finally fail to update content. iCloud will not connect and show another 'verification failed' message.
My iPhone wouldn't even let me use this site to submit the question. So I am using my iPad 2 running iOS 6.1.3 and everything is just fine. Everything that is not working on my phone is working on the iPad just fine.
(an additional note: I have a reminder with geo-fence set a mile away from my current location and it will periodically go off even though my location hasn't moved in hours... Do not know if this is related or not but it started happening at the same time)

I am having the same problem: I am getting several times a day on my iPad (3rd generation) and my iPhone 4S the messages:
Cannot Verify Server Identity
The identity of "webdav.facebook.com" cannot be verified by Facebook.
Review the certificate details to continue.
Every time, I choose cancel.
I don't know, what triggers this message (I am not actively using Facebook or any app that would try to access Facebook at the time when this failure messages happen.
I am using the newest iOS version (8.1.3).
I am living in China.
I don't get the error messages when I am connected via a VPN.
So far that I remember - the problems started somewhere at the beginning of 2015.
The 'Not Trusted' Certificates are usually never the same. I did had - among others -:
*.littletonpublicschools.net.
lds140.securednshost.com
auvisa.com
langel.jp
www.colesfinancialservices.com.au
*wpengine.com and even
localhost
What can be done? It's really annoying.

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