Why we are facing connection problem with Vijeo Citect 2015 with Historian .
In Vijeo Citect 2015, a built-in user's password has the ability to use a new encryption method. This new encryption is only applied when you change a password or create a new user in Vijeo Citect 2015. When upgrading an existing project from previous versions, passwords will remain in the old encryption until the user records are updated. To do this, you would need to go to Project Editor->System->Users and then hit replace on each user for which the password is to be encrypted with the new method.If you are creating a new project in Vijeo Citect 2015 using the built-in user accounts, the new algorithm will be implemented and work seamlessly with Vijeo Citect 2015 clients.