Originally Posted by orndorf77
today I went to a website and got a error message saying problem with website security certificate we recommend you close webpage and do not continue to this site . I clicked on go to website anyway, can I get a virus ? I did not put any of my information in this website am I safe ?
You can get a virus from visiting legitimate sites such as Forbes, CNN, Facebook, etc. One of the attack vectors is to use ads to infect systems. Look up the recent 30 under 30 forbes scandal where people were asked to turn off adblocker and got infected. A certificate does not mean it is safe.
Originally Posted by TwoCables
The certificate just certifies that the site is legit. That's all.
Partially incorrect. The main purpose of the certificate is to validate that the communication between you and the website has some sorth of encryption/confidentiality. Most known certificate authorities do validate the websites are legitimate prior to providing the certification but there are also providers that aslong as you pay them they will grant you one. The certificate is a sign that mostly show us " it should be safe for you to buy from this store" But technically means "No one other than the server will see your credit card number being input" what they do with the cc# is up to them.
Things that may show a certificate error: Like beer power said. Your system time, but this wil laffect every website (eg bios Time being in the past will cause this).
Certificate expired or was replaced by a new one and has not been propagated yet. Eg if you switch vendors (CA) it might take a few days to the information to be updated on the web.
If you want to be careful can do the following:
1) add a "total/all in one/365" Av solution which compares sites to known black-listings and therefore protects you, in some part, better than others; however i'm not sure how this works vs ads.
2) Adblocker: But if you do want to support a website make sure you allow adds from that site since this is how they get paid.
3) validate URL manually: look up RDNSBL listings.
4) If unsure, don't go there. If you see a green mark in a potato you wouldn't eat it right ?