# Trying to understand urn:acme:error:badNonce

**URL:** <https://community.letsencrypt.org/t/trying-to-understand-urnerror-badnonce/102652>\
**Category:** Help\
**Created:** [September 24, 2019, 4:23am UTC](https://community.letsencrypt.org/t/trying-to-understand-urnerror-badnonce/102652 "2019-09-24T04:23:46Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![\_az](https://avatars.discourse-cdn.com/v4/letter/_/22d042/32.png) [@\_az](https://community.letsencrypt.org/u/_az)\
**Post date:** [September 24, 2019, 7:49am UTC](https://community.letsencrypt.org/t/trying-to-understand-urnerror-badnonce/102652/8 "2019-09-24T07:49:23Z")

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> [@ronaldgetz](#):
>
> VERSION=“0.5.0”

Great. I can 100% reproduce the issue at 0.5.0:

```
alex at x1 in ~/Downloads/dehydrated (tags/v0.5.0)
$ ./dehydrated -6 -f config -c -x
# INFO: Using main config file config
Processing 80755380.ngrok.io
+ Checking domain name(s) of existing cert... unchanged.
+ Checking expire date of existing cert...
+ Valid till Dec 23 06:36:00 2019 GMT Certificate will not expire
(Longer than 30 days). Ignoring because renew was forced!
+ Signing domains...
+ Generating private key...
+ Generating signing request...
+ Requesting challenge for 80755380.ngrok.io...
  + ERROR: An error occurred while sending post-request to https://acme-staging.api.letsencrypt.org/acme/new-authz (Status 400)

Details:
{
  "type": "urn:acme:error:badNonce",
  "detail": "JWS has no anti-replay nonce",
  "status": 400
}

```

Upgrade to 0.6.5.

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_[View the full topic](https://community.letsencrypt.org/t/trying-to-understand-urnerror-badnonce/102652)._