Possible Problems and Solutions:
The following table is designed to assist you with troubleshooting this error.
When The Error Message Was Received
Received when attempting to log into the i2b2 Web Client after installing i2b2 on a Linux machine
SElinux is enabled which prevents access to the application PHP files
sudo setsebool -P httpd_can_network_connect 1
2. Disable SELinux( recommended only in Dev env) by any of the following options