Network connection icon always shows "not connected" even though I am

Hello,

whenever I'm connected to a network, the attached icon is displayed. The other icons (e.g. the spinning wheel thing when establishing a connection) do work, but the "connected" icon seems to have disappeared for no reason. I did not install any new software and I don't know what else might have triggered this, it was just that way when I booted my pc a few days ago.

Any help is appreciated, thanks.

Thanks for your reply, but I'd already tried that and it didn't work.