There are many services, which can listen port 80 on windows. Our Sense application uses port 80 by default. If this port is blocked by a other application this can give some problems like :
Plugin list not visable
Backup settings fails
API not working
App not working
This can be solved by changing the default port (80) to a other port :
/wiki/spaces/KB/pages/8899199110
Or you can detect what process is blocking port 80. Luckily you can detect and stop them all running simple console command:
NET stop HTTP
Restart the “Sensepluginmanager” services and try to open the webpage or pluginlist again.