unable to login to DI server through web browser but can login using spoon

Hi,

I have a strange problem, I have installed DI Server, I was able to login to it via web browsers (Internet Explorer/Chrome) and aso via spoon untill yestrday, but today after restarting the DI Server, I cannot login to DI server via web browsers but I can successfully login to it via spoon and also able to import jobs and able to schedule jobs

The only problem is I cannot login to DI Server using web browsers