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Dahua NVR - failed to connect from outside

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Im using Dahua XVR together with gDMSS Lite app. If Im within local LAN - everything works fine. If Im outside - Im getting message "failed to connect", nevertheless seems that app is connecting to the XVR.

port 37777 is forwarded from outside ( I have specific range of ports forwarded by ISP to internal networks: 3901-3910, port 80 is not available from outside).

In my case: outside IP:3901 -> internal IP:37777.  But live preview still not working. Can you advise me please where is a problem? 

Thank you!

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Port range forwarded on the router and changed accordingly for NVR configuration.




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