I changed the cookie expire time to different values as proposed but it doesn't make a difference. I contacted my ISP "godady.com" and their answer is: In order for us to determine if your application will function with our hosting, we will need you to provide us with a detailed list of the server requirements for this application. As for installing a third party application, we cannot provide direct support or instructions for this process, as it would depend on the application. However, if you encounter a server error or have questions about using one of our interfaces, please provide us with details and we would be happy to assist you. who can provide me a detailed list of server requirements that I can send to godady.com If I move prestashop and database to another ISP (networksolutions) than everything works fine. Who has suggestions or can help me solving this problem? Thanks a lot Guy