Hi,
I thought I'd post a TIP on Dahua GDMSS remote connections.
I found lots of posts about problems with this and this might help quite
a few people out.
1 If you have an IP address ( 216.75.115.82 ) you only need to forward port 37777
for GDMSS to work.
2 If you use a domain name eg. mydahuacams.webhop.net
you will need to make 2 changes from the regular setup.
forward 37777, forward the web port ( 80 )
use the web port in GDMSS.
This has worked on straight access to a Dahua cam, ans a Dahua XVR