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.
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.