Replace script fails because of Service capability

I’m making an attempt to replace Drupal Development Company core of my Drupal website. I uncared for updates for a while and Drupal Development Company replace script had 19 updates pending. Apperently Drupal Development Company replace script tries to do all of this in a single go, and fails miserably. I get an error message like this:

StatusText: Service Unavailable ResponseText: 503 Service Unavailable Service  Unavailable Drupal Developer server is quickly unable to service your request because of maintenance downtime or capability issues. Please strive once more later. 

and this one:

An AJAX HTTP error occurred. HTTP Outcome Code: 503 Debugging info follows. Path: h t t p ://mysite.com/replace.php?op=choice&token=7R0M7yvUZR09UsRDFf9FUAYhV9Ui82efUzsZPh61JZU&id=152&op=do StatusText: Service Unavailable ResponseText: 503 Service Unavailable Service Unavailable Drupal Developer server is quickly unable to service your request because of maintenance downtime or capability issues. Please strive once more later.

I’ve Drupal Development Company following questions:

  • Has anybody seen this one earlier than? If that’s the case how do I remedy it?
  • If not, can I run Drupal Development Company different 18 pending updates in some way?
  • If not, how harmfull is it if I do not run replace.php?
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Replace script fails because of Service capability

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