hi,

dvr has default client port of 8880 but when i enable port 8880 on my router a port test shows it as failed.

I have temp disabled firewall, still no joy.

any clues how to open that port

You need to set up port forwarding in the router. You may refer to the instructions at https://www.dynu.com/Resources/Tutorials/DynamicDNS/RouterandDevices/RouterPortForward

Thanks Tim,

But done all that and it did work before.

However kept playing and its now working OK.