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Light one on, light two flashing

Moderator (Retired)

This issue has the following symptoms:


  • The power lights on and light two flashes constantly
  • Light two does not go solid


Troubleshooting steps:


Wait 24 hours.
It can sometimes take up to 24 hours for the Sure Signal to fully register with the server. Before attempting any of the steps below, please wait 24 hours.


Check for planned maintenance.

Check the forum for any planned maintenance. This will be announced at the top of the Sure Signal forum.


Check that your Sure Signal has registered successfully.
Before your Sure Signal can connect to our network, you need to register it with us. Our Sure Signal registration video explains how to do this. 


To check your Sure Signal is registered, login to your My Vodafone Account and click on the 'My Sure Signal' tab. Your Sure Signal details should be listed, along with the status 'Registered'.

If all of the above steps have been followed, please see below for more in-depth diagnostic steps on router configuration. If you need further support with these steps, please contact your ISP.


Manually configure your router to allow port-forwarding.
In most cases, routers support a system called Universal Plug-n-Play (UPnP), which sets up port-forwarding for you automatically. If you’ve got a complicated network setup, or a complex router, you may need to enter these settings manually.

Please see the following for a list of port numbers and IP addresses that need to be forwarded to your Sure Signal's internal IP address. For instructions on how to do this, we recommend you contact your ISP or Router Manufacturer, or refer to the default guide for your particular make and model, over at


Ports and Protocols:

  • 8 – TCP/UDP                 (All routers)
  • 50 – TCP/UDP               (All routers)
  • 53 – TCP/UDP               (Virgin Super Hubs)
  • 67 – UDP                      (Virgin Super Hubs)                                                    
  • 68 – UDP                      (Virgin Super Hubs)                                        
  • 123 – UDP                    (All routers)     
  • 500 – UDP                    (All routers)     
  • 1723 – TCP/UDP           (BT Home Hubs)          
  • 4500 – UDP                   (All routers)     
  • 33434 – 33445 – UDP    (Virgin Super Hubs)


Destination IP Addresses:



Your router also needs to assign the Sure Signal with a DNS (Domain Name Server) address via DHCP (Dynamic Host Configuration Protocol).

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