---
isPrivate: true
title: MySQL Localhost Error - Localhost VS 127.0.0.1
description: Datadog, the leading service for cloud-scale monitoring.
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  127.0.0.1
---

# MySQL Localhost Error - Localhost VS 127.0.0.1

Setting "localhost" in the mysql.yaml file may produce this error:

```text
mysql
-----
- instance #0 [ERROR]: OperationalError(2003, 'Can\'t connect to
MySQL server on \'localhost\' ((1045, u"Access denied for user
\'datadog\'@\'127.0.0.1\' (using password: YES)"))')
```

The workaround is to grant permissions to [datadog@127.0.0.1](mailto:datadog@127.0.0.1) , rather than datadog@localhost

This problem is documented in [this closed Datadog Agent issue](https://github.com/DataDog/dd-agent/issues/1120) and referenced in the [MySQL documentation](http://dev.mysql.com/doc/refman/5.5/en/can-not-connect-to-server.html)