I was playing around with Ettercap and I performed an ARP spoofing, MiTM attack on a friends computer as a joke. Now (about a day later) she tried to login to a website for work and it said "Your connection is not private" NET::ERR_CERT_DATE_INVALID . She can still access email, Facebook etc. I am almost certain it is not my fault. However it seems like a HUGE coincidence that their certificate just happened to expire a few hours after the MiTM attack. I also tried connecting to the site with another computer and then connected a mobile hot-spot to the computer and tried connecting again. I still get the same error. Is there any chance that this is my fault?
My friend contacted a coworker (Who is in a different country) and the coworker said that she can't connect either. So it is not my fault after all. Apparently their SSL certificate has expired.