nsm2

Thank you for the lead, Frederick! I was just embarking on a long list of docs on Varnish, both on the main site and on https://kristianlyng.wordpress.com (a blog by one of the developers).

Does W3TC send wildcards in its PURGE requests? More to the point, does W3TC send the URL as a literal string or as a regexp? (which impacts whether I use the 2nd or 3rd code example on that page)

ditto the “cache control policy” setting

#1) Varnish: When using an array of Varnish caches, with cache purging enabled, is there a recommended VCL script?

Currently, I’m using Rafal’s workaround of using Forced Overwriting. I want to investigate it further by stepping through the source code, but don’t have time right now.

I mostly ditto your experiences:
* Test CloudFront Upload always works fine.
* I removed and reinstalled the plugin from scratch. I *think* that wasn’t effective.
* What did do the trick was creating a new S3 bucket and CF distribution and repopulating it.
* I’ve cleared the Upload queue, checked “Force over-writing of existing files”, and manually initiated a re-upload via the “exporting media library to CDN”, “Upload includes files”, and “Upload theme files” buttons. That seems to have done the trick for 90% of the files. (NOTE: “Upload minify files” always shows 0 files. Is this a related problem?)

My config: (should I post my w3-total-cache-config.php file? [other than passwords, obviously])
Running on an EC2 instance using EBS storage.
* General Settings:
** All cache types are enabled. Everything is set to APC, except the CDN is CF.
** Enable file locking: I’ve tried both ways. Currently unchecked.
* CDN Settings:
** General: All six items are checked.
** Advanced:
*** Enable changed files auto-upload: checked
*** Auto upload interval: I had experimented with lower values (600), but restored to its original value of 3600.
*** Re-transfer cycle interval: ditto. currently back to 900.
*** Re-transfer cycle limit: 25
*** filetypes: Appended “;*.pdf” to all three fields
*** never touched the rest.

Frederick and team: Please let us know what further info would be helpful in resolving this.

ruditrg: Did it work at any point?

If it worked initially but then stopped working after some time, then let us know any patterns you’ve seen in which files work and which fail. Also let us know what error messages you’ve seen in the Unsuccessful File Transfer Queue (although everybody seems to be having the same experience: all entries say “Object already exists”.

If however uploading files to the CDN via the plugin has never worked, then please start a new forum topic. This topic is specifically on the issue of functioning W3TC CDN setups that inexplicably fail after some time.

As I said in the OP, there are many entries in the Unsuccessful File Transfer Queue, but they all say “Object already exists”.

mjmcgowan: Are you using CloudFront or a different CDN?