can't remote login of security camera's server after modem change

Hi,

I changed my Cox's modem (from Motorola's phone/internet combo to internet only Cisco's DPC3010 modem) and I can login to my security camera's server without any problem at home's Wi-Fi.  However, I can not login to this server while using the Wi-Fi network outside of my house.

Every thing used to work fine with the old modem, but not the new one.  Is there any thing that I missed?  I did not change any port-forwarding or any other setting in my Linksys router.

Thanks,

Dennis