I've been seeing a number of messages such as this: <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";> <html> <head> <title>503 backend read error</title> </head> <body> <h1>Error 503 backend read error</h1> <p>backend read error</p> <h3>Guru Mediation:</h3> <p>Details: cache-dca17747-DCA 1506600623 2675462800</p> <hr> <p>Varnish cache server</p> </body> </html>
-Nigel
