To resolve Cisco router error code 66 you can test the speed of internet of your router and restart your router by unplugging from the power socket. Go to the settings of the router by going through the router’s IP address and if there are changes in the settings, then you can do it into default one. 

  • Cisco router
  • Cisco router
  • Cisco router
  • Cisco router
  • Cisco router
  • Cisco router

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