@JT_Singh You are going around in circles! You maybe need to start afresh and set up the system properly with regard to the network and Hik Connect. Unfortunately it's not something where you can pick which bits to do and which to leave and hope for the best - there will be issues as you've experienced, whether that's failure to connect, failure to receive notifications, poor live view or playback. Most of the issues I see on this forum are with people using UPnP/NAT. With it set up correctly you should have no such issues. For now, if you have a local monitor/TV connected to the NVR use that - forget about using iVMS-4200 until everything else is working the way you want. My advice would be as follows and in the example below the configuration is being completed using the NVR menu with locally connected monitor and mouse. It can be completed with a web browser but the menu layout will be different and at times you'd lose connection while changing ports etc:
- Temporarily disable Hik-Connect in the NVR. Network > Advanced > Platform Access and on your phone, sign out on your Hik-Connect app. (as you're making changes it makes sense to temporarily take it offline)
- NVR. Network > TCP/IP. Ensure the Enable DHCP box is unchecked and that you have a static IP address and relevant details entered to suit your local network. Using mine as an example (Virgin Media): IP-192.168.0.250, Subnet-255.255.255.0, Gateway-192.168.0.1, Preferred DNS- 8.8.8.8, Alternate DNS-8.8.4.4. (it's important when using port forwarding to use a static IP address. The DNS addresses are those preferred when using Hik Connect.
- NVR. Network > NAT. Ensure the Enable box is unchecked/disabled (having this enabled when also using port forwarding causes issues)
- NVR. Network > NTP. Enable, Interval 60, Server-uk.pool.ntp.org, Port-123 (keeps your NVR time and all of the connected cameras synchronised)
- NVR. Network > Advanced > More Settings. Change the default HTTP, Server and RTSP ports - example HTTP-49000, Server-49001, RTSP-49002. (the default ports are well known and should be changed if using port forwarding to eliminate/reduce illegal access attempts)
- ROUTER. Access your routers config page, find the port forwarding section and set up a rule/rules to forward (using the example above - modify as required to suit your ports and IP address) TCP ports 49000, 49001, 49002 to 192.168.0.250 (your model of router will affect how you do this - some routers will allow you to create one rule as a range of ports where others will require one rule per port or the creation of a custom service)
- Prove your port forwarding works. On a device connected to your network, go to whatsmyip.org > Port Scanners > Custom Port Test. Enter the first port and click scan port - You should see "port 49000 is open" repeat for the other ports. If it fails - fix your port forwarding in the router.
- NVR. Network > Advanced > Platform Access. Re enable Hik Connect. Reboot the NVR if it doesn't go back to online.
- PHONE. Log back into your Hik Connect app.
- PHONE. In Hik Connect to the right of your site click the settings icon > Configure DDNS. Port Mapping Mode-Manual, Server Port-49001, HTTP Port-49000 (or whatever port numbers you used), User Name-admin, Password-your NVR Admin password
That should be it and the end of your issues - get stuck into another bottle of Whisky