Thanks for posting in the Slingbox Answers forum! I'm sorry to hear you are having trouble getting an Internet connection to your Slingbox Classic.
When you say the LAN indicator turns off, then on, do you mean the network light is blinking? If so, this means the Slingbox has not received a valid IP address from your network.
Below is a link to an article from our support site that may help with troubleshooting:
Feel free to reply!
The Sling Moderation Team