ISSUE
When I try to bring up my Webex website, I see an error 'HTTP 1.1 Service Unavailable'.

CAUSE
Webex website is currently being switched over to another set of servers. During this switchover, the cached DNS entries for your Webex website may temporarily point to the incorrect servers.

RESOLUTION

• Close all your web browsers, then start a new web browser and attempt to connect to the Webex website.
• Clear the cache and cookies of your web browse:
  • Mozilla Firefox - WBX38898 - How Do I Clear my Cache and Cookies in Mozilla Firefox?
• Flush the DNS cache - WBX18967 - How Do I Perform a DNS Flush from DOS Command Prompt?