[wp-trac] [WordPress Trac] #44322: When editing a file after updating to wordpress 4.9 or higher, the error message is exposed and can not be edited

[WordPress Trac]

#44322: When editing a file after updating to wordpress 4.9 or higher, the error
message is exposed and can not be edited
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 Reporter:  kimsijin      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Editor        |    Version:  4.9
 Severity:  critical      |   Keywords:
  Focuses:                |
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 When editing a file after updating to wordpress 4.9 or higher, the
 following error message is exposed and can not be edited :

 Unable to communicate back with site to check for fatal errors, so the PHP
 change was reverted. You will need to upload your PHP file change by some
 other means, such as by using SFTP.

 Attempt to edit a file after changing all plugins to disabled, the editing
 will still fail with the same error message.

 To find a more accurate cause, we installed a plugin called Health Check.
 Health Check has informed a problem with Loopback.
 (For more details on this, please check the attached image.)

 So searched the loopback in the support forum and found the following
 information.
 https://wordpress.org/support/topic/how-to-disable-loopback-request-
 checks-for-sandbox-via-functions-php/

 Based on the information found, editing files became normal after
 modifying wordpress code sources on the site where the problem occurred.

 The problem of not able to edit files in wordpress 4.9 or higher is
 considered a wordpress code issue.
 We would appreciate it if you could revise it and distribute it in the
 next version.
 [[Image(E:\Download\health_check.png)]]

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Ticket URL: <https://core.trac.wordpress.org/ticket/44322>
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