Had a very odd issue with GotoMeeting client on a Laptop PC. The client refused to connect so the user could attend an online meeting. It was acting like it had no network connection.
However, the system clearly had a working network connection. Browsers pulled up webpages, email clients worked, and I could ping/nslookup various sites. Later I noticed the system complaining about the AV being out of date, but the definitions listed were the most recent ones.
I looked for signs of a virus and/or spyware and found none. Then I noticed the clock was slightly off so I thought maybe a CMOS battery. Voila... the clock was set nearly one year ahead. Once I adjusted the date to the correct time, some of the odd systems behaviours went away and GotoMeeting connected without issue.