I'm trying to figure out why a Hikvision DS-2DE3304W-DE IP camera takes up to 48 hours to come online after a power reset. The RTSP, HTTPS & Server ports are correctly configured and forwarded on the router. The latest versions of both the SADP tool and IVMS-4200 can see the camera, but I get timeout errors if I try to do any configuration, use Live View, etc. via IVMS-4200. I also get timeout errors if I try to ping the camera's IP address or if I try to access the camera via a browser (I've tried IE, FireFox & Chrome). What seems to work is to "do nothing" for about 48 hours, whereupon the camera magically comes online and all is well until the next power reset. Clearly something is wrong, but I have no idea what. I'd appreciate any troubleshooting suggestions.