Rate Limits for request certificates


Our website sometimes got this error messages: “get challenge err[acme: error code 429 “urn:ietf:params:acme:error:rateLimited”: Error creating new order :: too many new orders recently: see https://letsencrypt.org/docs/rate-limits/]”

I understand the limit is: 300 new orders in 3 hours, but can you tell me how you count the new orders?

For example, if I request (or renew) 300 certificates at 12:00:00, does it mean I can only request the new certificates at 15:00:00?

Thanks you


It's basically a running total as of the current moment - "how many orders were created in the last 10800 seconds"?

Any time that answer comes out to 300 or higher, you're rate limited.

There's no reset time or anything like that.

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Is there a way to increase the rate limit? Like purchase option for business or become a sponsor..etc?

Anybody can ask for a rate limit increase.

Keep in mind that it takes a few weeks to apply for one, and you’re only likely to get it if you have a legitimate ongoing need - it won’t help you resolve a one-time problem.


Hi @liuchiayen

the main question: Is that error message result of a buggy client?

Or do you have so much different domain names?

We do have many different domain names requests by our customers, and all of these are done by one single ACME account.


We’re always looking for sponsors! :slight_smile:

Take a look at the rate limiting document that @_az posted and fill out the form linked in that document.

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@Phil ,
May I ask any benefits to be a sponsor? :slight_smile:

Take a look at become a sponsor. If sponsorship is not an option for you or your organization please consider simply donating any amount.


Send our fundraising team an e-mail at sponsor@letsencrypt.org and we can talk more about the benefits of sponsorship! It’s a great way to support a more secure Web.

Rate limit adjustments are available to everyone, regardless of sponsorship. Feel free to fill out that form previously linked should you require an adjustment.

JP (Fundraising Specialist at Let’s Encrypt)


Thank you all, we will discuss this topic with teams and see what we can do?

Thanks again


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