# Error 503 on ocaml.org

**URL:** <https://discuss.ocaml.org/t/error-503-on-ocaml-org/17342>\
**Category:** Site Feedback\
**Created:** [October 1, 2025, 2:01pm UTC](https://discuss.ocaml.org/t/error-503-on-ocaml-org/17342 "2025-10-01T14:01:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![yawaramin](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/yawaramin/32/3384_2.png) [@yawaramin](https://discuss.ocaml.org/u/yawaramin)\
**Post date:** [October 1, 2025, 2:01pm UTC](https://discuss.ocaml.org/t/error-503-on-ocaml-org/17342/1 "2025-10-01T14:01:57Z")

</div>

Searching for a package on the website: [https://ocaml.org/p/zarith/latest](https://ocaml.org/p/zarith/latest)

Getting the following error:

```auto
Error 503 Backend fetch failed
Backend fetch failed

Guru Meditation:
XID: 162300016

Varnish cache server

```

---

<div class="post-metadata">

**Author:** ![mtelvers](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/mtelvers/32/5834_2.png) [@mtelvers](https://discuss.ocaml.org/u/mtelvers)\
**Post date:** [October 1, 2025, 5:11pm UTC](https://discuss.ocaml.org/t/error-503-on-ocaml-org/17342/2 "2025-10-01T17:11:58Z")

</div>

Unfortunately, a cooling failure occurred in the data centre that hosts the documentation pages of [ocaml.org](http://ocaml.org). This necessitated that the machines be powered down to prevent damage. These services have now been restored. Sorry for the inconvenience that this caused.