I encounter similar problems.

Router: Linksys
IP cam: Panasonic BL-C131
ISP: Netvigator

Thank for your help.

In Router:
The DDNS service should be set as >>><<< or TZO.com? Is it the problem?

Thank for your reply.

HOwever, I cannot login in my router today.(previously, it is function) to change the setting.

I go to the Ip: http://192.168..x.x and login as ususal but the IE just keeps on loading and loading