scheduling is not working in HandleHttpRequest processor of apache NIFI tool

[#1]

scheduling is not working  in HandleHttpRequest processor of apache NIFI tool.

if I am hitting the port  from localhost then the processor is working  otherwise  scheduler is not working and showing error  service is not available.

[#2]

There is not much information here, could you perhaps share a minimal flow that does not work?

Also what points towards a problem in scheduling (opposed to e.g. wrong url or firewall issue).