I've been doing this same process for many years and never had this issue happen.
On the nvr at our client's site i set up a dynamic ip via dyndns.com
**** * *** ** ****** *** RTSP ***** *** ***...
** ***** ** * *** *** public ** ** *** **** ***.
(** **** ** *** *** ****** rtsp ***, **** ** *******)
****://****:****@*.*.*.*:***/*******/**/**/***** - **** *****
****://****:****@****.******.***:***/*******/**/**/***** - **** **** *** ****
*** ** * *** *** ******* domain **** ** **** *** ****.
***** *** ** ****** ** ******* characters ** *** ******.
**** *** ** ****. * **** this ******* ***** **** ** ** be **** **** *** ***** ***** when ***** *** **.
*** ******* ****** ***** ** ****** into *** ***.
*** ****** ***** ** ****.
** **** **** *** **** *** RTSP.
* *** ****** *** **** ***** is *** **** *** **** *** public ** *** ** **** *** work ** * *** *** ******* domain.
*** *****?
**** *** ***** * ********* ***** player ******* ***?
********, ** ***** **** **'* * 'DDNS ** ****** **' ******* **** than ** ** * ***** ****** issue.
*** * ******'* *** ***** ** either **** *** **********.