TYPO3 Exception 1396795884¶
Below, the TYPO3 community may have provided additional information or solutions for this exception. However, these may or may not apply to your particular case. If you can provide more information, you should come back here and add your experience and solution steps to this issue once you have resolved it.
General TYPO3 troubleshooting tips can be found in the section "Troubleshooting" of the menu, and live support is available in the TYPO3 Slack channel #typo3-cms. (See How to get your TYPO3 Slack account.)
The current host header value does not match the configured trusted hosts pattern!¶
Error displayed during installation of TYPO3¶
Usually, when installing a new TYPO3 instance, the system will detect
the instance has not been configured yet and will redirect to the
installer to proceed with the installation. However, depending on web
server configuration, this trusted hosts pattern error may still be
thrown and the redirect will not be performed. An easy way to circumvent
this is to just manually add the path url
typo3/install.php in the
browser to directly reach the installer, which will take care of the
trusted hosts pattern setting in one of its installer steps.
Error displayed on an existing instance¶
You see this error, because the submitted HTTP host-header does not
trustedHosts configuration. You may want to adjust the trusted
host pattern, which is security mechanism to validate the HTTP
host-header and prevent host spoofing.
Please read the security advisory »TYPO3-CORE-SA-2014-001« to understand the need for this configuration option.
The trusted host pattern may be set with the Install Tool (Backend >
Install Tool > All configuration > Toggle all and find
trustedHostsPattern) or by editing
This is a regular expression pattern that matches all allowed hostnames
(including their ports) of this TYPO3 installation, or the string
"SERVER_NAME" (default). The default value
SERVER_NAME checks if the
HTTP Host header equals the
SERVER_PORT. This is secure
in correctly configured hosting environments and does not need further
Under certain circumstances, it might be required to change the default configuration. A typical case is a hosting setup with a Load Balancer, CDN or a HA proxy.
Typical configuration examples¶
The following matches all hosts that end with .domain.com with all corresponding subdomains:
A common setup could include the leading www. (optional):
The following matches all hosts with subdomains under .domain.com and .otherdomain.com:
Be aware that HTTP Host header may also contain a port. If your installation runs on a specific port, you need to explicitly allow this in your pattern. To allows only www.domain.com:88, not www.domain.com, you could configure:
To disable this check completely (not recommended because it is insecure) you can use ".*" as pattern:
Take a look at the extension 'hosts_pattern' which generates the patterns for you