Warnings on Admin Page¶
Your ownCloud server has a built-in configuration checker, and it reports its findings at the top of your Admin page. These are some of the warnings you might see, and what to do about them.
Cache Warnings¶
“No memory cache has been configured. To enhance your performance please configure a memcache if available.” ownCloud supports multiple php caching extentions:
- APC
- APCu (minimum required php extension version: 4.0.6)
- Memcached
- Redis (minimum required php extension version: 2.2.5)
- Xcache
You will see this warning if you have no caches installed or if your cache does not have the required minimum version installed; older versions are disabled because of performance problems.
If you see “{Cache} below version {Version} is installed. for stability and performance reasons we recommend to update to a newer {Cache} version” then you need to upgrade, or, if you’re not using it, remove it.
It is not required to use any caches, but caches improve server performance. See Caching for more information on installing and using caches.
You are accessing this site via HTTP¶
“You are accessing this site via HTTP. We strongly suggest you configure your server to require using HTTPS instead.” Please take this warning seriously; using HTTPS is a fundamental security measure. You must configure your Web server to support it, and then there are some settings in the Security section of your ownCloud Admin page to enable. The following manual pages describe how to enable HTTPS on the Apache and Nginx Web servers.
Enabling SSL (on Apache)
The test with getenv(“PATH”) only returns an empty response¶
Some environments are not passing a valid PATH variable to ownCloud. The Configuration notes to php-fpm are providing the information how to configure your environment.
The “Strict-Transport-Security” HTTP header is not configured¶
“The “Strict-Transport-Security” HTTP header is not configured to least “15768000” seconds. For enhanced security we recommend enabling HSTS as described in our security tips.”
The HSTS header needs to be configured within your webserver by following the Enable HTTP Strict Transport Security documentation
/dev/urandom is not readable by PHP¶
“/dev/urandom is not readable by PHP which is highly discouraged for security reasons. Further information can be found in our documentation.”
This message is another one which needs to be taken seriously. Please have a look at the Give PHP read accesss to /dev/urandom documentation.
Your web server is not yet set up properly to allow file synchronization¶
“Your web server is not yet set up properly to allow file synchronization because the WebDAV interface seems to be broken.”
At the ownCloud community forums a larger FAQ is maintained containing various informations and debugging hints.
Outdated NSS / OpenSSL version¶
“cURL is using an outdated OpenSSL version (OpenSSL/$version). Please update your operating system or features such as installing and updating apps via the app store or Federated Cloud Sharing will not work reliably.”
“cURL is using an outdated NSS version (NSS/$version). Please update your operating system or features such as installing and updating apps via the app store or Federated Cloud Sharing will not work reliably.”
There are known bugs in older OpenSSL and NSS versions leading to misbehaviour in combination with remote hosts using SNI. A technology used by most of the HTTPS websites. To ensure that ownCloud will work properly you need to update OpenSSL to at least 1.0.2b or 1.0.1d. For NSS the patch version depends on your distribution and an heuristic is running the test which actually reproduces the bug. There are distributions such as RHEL/CentOS which have this backport still pending.