Frequently Asked Questions
This error (also frequently seen as "503 Service Unavailable" or "The requested website is temporarily not available due to a resource limitation.") means there are too many total simultaneous non-cacheable HTTP requests in progress for your site. This is an extremely rare condition, but the causes, in order of decreasing likelihood, are:
Please be aware that while almost everyone starts out thinking #4 is the reason that applies to their situation, the cause almost inevitably turns out to be something else. A good rule of thumb is that each possible explanation above is about ten times less likely than the one above it, so the top one is 90% likely and the bottom one is about 0.09% likely.
If this message persists long enough to cause problems, the explanation is most likely the second one. In that case, the way to troubleshoot it is to identify and resolve the cause. Coding problems that can cause this include, but aren't limited to:
Some poorly-written WordPress and Drupal plugins have been known to cause these sorts of problems under heavy loads, particularly ones that deal with statistics or running periodic scheduled tasks.
If you have a subscription membership and submit a secure support request while the problem is occurring, we can typically identify the problem URLs for you, and may be able to give you some insight as to what they are waiting for. After the fact, it may be possible for you to get some idea of what happened by looking at your site's access logs, if they were enabled.
Please keep in mind that this limit is not some nuisance we put in at random to cause problems for our members. It is a crucial protection that keeps your site (and others') safe and available. When someone says they want it removed, we hear: "My car would go a lot faster through the mountains if it didn't skid along the guardrail every time I go around those hairpin curves! Take that guardrail out!" We know from experience that if we take out the guardrails, the car won't go faster; it will fly off the side of the mountain and end in a fiery crash. You may be willing to take that risk with your site, but since ours is a shared hosting service, we can't risk letting you take others down with you. If you want the limit raised, be prepared to show us ample concrete evidence documenting both your sustained high traffic levels and the excellent performance of your highly-optimized code.