If you are a regular user of PHPList then you may have come across the following problem sometime. This error occurs if the IP address through which you are connected to the internet changes any time during your login session in PHPList. If it does then PHPList will end your session and take you to the login screen as shown below with the error message in red “Your IP address has changed. For security reasons, please login again”.
This feature is enabled by default in PHPList and you can change it by downloading the config.php file from the config folder in the PHPList installation directory. Once you have downloaded it then please open it and search for CHECK_SESSIONIP. The value for this setting is set to 1 by default. You can change it to 0 and save the file and re-upload it. Now you will not face any problems related to this issue.
Hope the above helped.