[wp-trac] [WordPress Trac] #37431: Update WordPress 4.5.2 > 4.5.3 Failed - The update could not be unpacked

[WordPress Trac]

#37431: Update WordPress 4.5.2 > 4.5.3 Failed - The update could not be unpacked
-------------------------------+------------------------------
 Reporter:  konobi             |       Owner:
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  Awaiting Review
Component:  Upgrade/Install    |     Version:  4.5.3
 Severity:  normal             |  Resolution:
 Keywords:  reporter-feedback  |     Focuses:
-------------------------------+------------------------------
Changes (by dd32):

 * keywords:   => reporter-feedback


Comment:

 Hi @konobi and welcome to Trac,

 A few quick questions for you to help narrow down the direction to take to
 solving this

 Does this happen on multiple installations? Did it happen with previous
 versions, or is 4.5.3 the first to cause it / first version you've tried
 upgrading on this system?

 Do Plugin/Theme upgrades or installs work?

 Has it previously work on this web host?

 ----

 Some background: This error condition is only hit in the scenario where
 WordPress has successfully connected to the filesystem, written data to
 disk (successfully), and either a) Realised that the ZIP file it's
 operating on is incomplete, or corrupt (but yet the ZIP handler could read
 it)   b) The files WordPress wrote to disk have gone missing (it happens)
 or  c) Something is wrong with the FTP `exists()` method on your server.

 Out of all of those, if it's reliably repeatable over multiple installs,
 and effects plugins/themes too, it's likely `c`.
 `WP_Filesystem_FtpExt::exists()` is probably failing on your server for
 some reason, it could be an incompatibility between PHP's FTP Extension
 and the FTP Server, the way we're parsing the response, or something else
 entirely related to your system.

 Anyway, with some answers from the above it should help pinpoint your
 issue.

--
Ticket URL: <https://core.trac.wordpress.org/ticket/37431#comment:1>
WordPress Trac <https://core.trac.wordpress.org/>
WordPress publishing platform