Hi - trying this service for the first time. I'm trying to configure my router for DDNS, I've already inputted the relevant info but it's asking for the server address and server port? Port must be 80 but doesn't seem to want to synchronise with the gnudip.dynu.com/gnudip/ address??
The router is a Huawei HG633.
Thanks!

Still not resolved, this is my screenshot as requested, see attached..

Did this ever get resolved? I have same problem.

Use the 'dyndns-custom' option. https://www.dynu.com/DynamicDNS/IPUpdateClient/HUAWEI-HG8245-HG8346M-HG8045H