Appion

h1. Troubleshooting the Web Server:

h4. Run the web server troubleshooter

A web server troubleshooting tool is available at http://YOUR_HOST/myamiweb/test/checkwebserver.php.

You can browse to this page from the Appion and Leginon Tools home page (http://YOUR_HOST/myamiweb) by clicking on [test Dataset] and then [Troubleshoot].

This page will automatically confirm that your configuration file and PHP installation and settings are correct and point you to the appropriate documentation to correct any issues.

h4. Firewall settings 

You may need to configure your firewall to allow incoming HTTP (port 80) and MySQL (port 3306) traffic:

<pre>

$ system-config-securitylevel

</pre>

h4. Security-enhanced linux 

"Security-enhanced linux (SELinux)":http://en.wikipedia.org/wiki/Security-Enhanced_Linux  may be preventing your files from loading. To fix this run the following command:

<pre>

$ sudo /usr/bin/chcon -R -t httpd_sys_content_t /var/www/html/

</pre>

see "this website":http://docs.fedoraproject.org/selinux-apache-fc3/sn-simple-setup.html  for more details on SELinux

h4. Slow image loading

If you find that you have many users viewing images, and the images are taking too long to load, there are several ways to address this.

# [[leginon:Alternative reduxd installation on file server]]

# [[leginon:Using imcache to cache mrc images as jpeg images of the default size on myamiweb]]