# IP SAN error: "CSR contains IP address in Common Name"

**URL:** <https://community.letsencrypt.org/t/ip-san-error-csr-contains-ip-address-in-common-name/239012>\
**Category:** Issuance Tech\
**Created:** [July 3, 2025, 11:10am UTC](https://community.letsencrypt.org/t/ip-san-error-csr-contains-ip-address-in-common-name/239012 "2025-07-03T11:10:24Z")\
**Posts on this page:** 1\
**Showing post:** 9

<div class="post-metadata">

**Author:** ![xlionjuan](https://sea3.discourse-cdn.com/letsencrypt/user_avatar/community.letsencrypt.org/xlionjuan/32/87121_2.png) [@xlionjuan](https://community.letsencrypt.org/u/xlionjuan)\
**Post date:** [July 8, 2025, 10:31pm UTC](https://community.letsencrypt.org/t/ip-san-error-csr-contains-ip-address-in-common-name/239012/9 "2025-07-08T22:31:45Z")

</div>

LEGO has push a commit to fix this, but haven't released

> <https://github.com/go-acme/lego/pull/2570/files>
>
> Fixes #2567

To test, install from `master`

```sh
go install github.com/go-acme/lego/v4/cmd/lego@master

```

And add `--disable-cn true` to your command.

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