Website works fine until a customer logs in and then they are presented with a 503 error when they browse to any category or product. The actual account page does appear fine once they are logged in.

Only way to rectify this is to clear the session cookies. I haven't installed any extensions recently and I'm not sure how long this has been happening.

Nothing in the Apache logs.

In Configuration > Web > Session Cookie Management I have tried two sets of configs to no avail:

Cookie Life Time: 3600
Cookie Path: /
Cookie Domain : .mydomain.com (The dot prefix is important)
Use HTTP Only : No
Cookie Restriction Mode: No

Cookie Life Time: 3600
Cookie Path: <blank>
Cookie Domain : <blank>
Use HTTP Only : Yes
Cookie Restriction Mode: No 

Is there anywhere else I need to look/check, I'm at my wits end.


  • Getting any error in log files? Feb 20, 2019 at 9:59
  • I can't see any Exception.log. Logging is enabled in the back-end.
    – Kowalski
    Feb 20, 2019 at 10:12
  • anything in /var/report/? Usually Magento creates a file with the error and trace for each error in that folder
    – HelgeB
    Feb 20, 2019 at 10:37
  • No. Well nothing dated recently.
    – Kowalski
    Feb 20, 2019 at 11:02

2 Answers 2


This appeared to be an unknown issue with Mirasvit Full Page Cache extension. Updated to latest version and the 503 errors were resolved.


Most of the time(80%) it will be your PHP error for me it due to php errors, so don't diverted on server issues check your logs or debug your code properly.

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