You may be sometimes faced such security exceptions while logging into your mail server or any other relevant websites. Most of the people will think that it will be the problem of the browser or the net and at last you will go for computer issue and call service provider and he will make it correct actually what is the real issue???
Your computer time and date will be set to default due to CMOS battery fault.
In such a system when you try to log in it will show such untrusted connection warning to avoid this temporarily just click in the 'I Understand the risk' and in the next window click on the Get certificate button and click Confirm security Exception button.
This small battery is used to store the initial settings of the system and time which you set, collectively it is called as BIOS(Basic Input Output Settings).
This information may be known for people who are all more attached with the system otherwise try to understand your computer's basic problems like this.
