There are a number of errors that indicate that our systems have been unable to establish a connection to your server. These errors include the following:

* Error: Connection timed out - connect(2)
* Error: getaddrinfo: Temporary failure in name resolution
* Error: No route to host - connect(2)

## Check your firewall

One of the most likely causes of these errors is a firewall on your system. You can find our IP ranges in this [FAQ](https://www.deployhq.com/support/faq/our-ip-ranges).

## Try again later

Unfortunately, sometimes there can be network problems between our systems and yours that mean we are unable to establish a connection. These are often temporary and the deployment may succeed if retried later.