Here's an interesting one. All of a user's certificates were expired. She couldn't get into any SSL sites, but could get into sites that were not needing SSL certificates. She mentioned she changed the battery and time for her computer was off. The year and date were off too.
What happened was when she lost power for the system by taking the laptop battery out, her CMOS also lost its settings because her CMOS bettery was dead and set her time and date was set back to the original date for the system. CMOS (complementary metal oxide semiconductor) battery give power to the system holding the date and system settings when the computer is powered off. How long a CMOS battery lasts, varies. It depends on how long the motherboard has been lying around before it is placed in a system.
What can you do to prevent this problem? Nothing. When you start to notice your time and date aren't holding, replace the battery. It isn't green to proactively change the battery. When it dies, take the battery out and take it to a drug store, electronics store, or department store so that you get the right battery. Most computers use a standard 2032 type battery.
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