Cannot send commands to the device

I have a color bulb and I have a lot of trouble trying to program it. Right now my problem is that the TCP commands don’t work so I tried to troubleshoot with telnet but putty cannot connect to the bulb’s IP at port 55443. Netcat also can’t connect to 55443.

Discovery with search request works although there was a period of time that it had stopped working for a few days. Now it’s fixed by itself.

Any ideas why it gives me a hard time?