The other day while working on our site unexpectedly going down, I was informed that Varnish was not working on hhauctions.org. I've disabled all plugins that we don't use. That has not solved this issue. How do I go about determining what is preventing Varnish from working?
Below is the output from isvarnishworking.com. I am curious about two things that I've highlighted - why the expiration date is in 1981 and what the PHPSESSID is.
The url we checked: hhauctions.org
HTTP/1.1 200 OK
[color=#1E90FF]Expires: Thu, 19 Nov 1981 08:52:00 GMT[/color]
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
[color=#1E90FF]Set-Cookie: PHPSESSID=xLJ4yzXLUllBjTCdjSTb22; path=/[/color]
Content-Type: text/html; charset=UTF-8
X-Cacheable: NO:Not Cacheable
Date: Wed, 14 Jan 2015 17:16:27 GMT
Via: 1.1 varnish
Link: http://wp.me/P5xIZS-g; rel=shortlink