Cannot log out of the Full page cache addon Varnish

I used varnish in the past and am thinking about using varnish again. There was no problem with the varnish composition before, and I worked on it about 3 times while reinstalling the server. Everything worked fine.
I recently reconfigured the server and got the add-on working, but I can’t log out. This is a restoration of the same version of the store with the same configuration, but I don’t understand this at all.
Anyone have any ideas about this?