I'll take the easy option and link to the excellent wiki setup for those troubleshooting connectivity issues like yours....
I'll admit the combination of Z-Wave and general connectivity from a PC / phone is an odd combination....
Just a tip.... pulling the power is not recommended.... indeed it is discouraged, unless under extreme circumstances, as it can lead to database corruption, amongst other issues (I assume).
Next I will throw in a few ideas of my own, likely all covered in the linked wiki....:
- Is your hub connected using an ethernet cable? Unlikely to be a Wi-Fi connection with a C-7, but thought I would check anyway...
- Do you have an IP address reserved on your router?
- Have you tried connecting to the hub using the diagnostic tool? Likely covered in the wiki as well as the general troubleshooting section of the HE documentation
It seems like a repetitive statement to make, but screenshots are often helpful, if you have anything useful you have noticed.... Or if anyone asks for them.