Does is last? What did you do? Did you try to perform a iisreset? 

yes it has been like that for a while

please provide steps for troubleshooting

We have limited info on what went on here before you ran into this issue. Can you answer some questions below:

1. is this a newly installed setup ? If not, did you perform any specific action like upgrade, repair before you ran into this issue ?
2. what feature pack are you using ?
3. is this an all-in-one commcell or is command center installed on a separate machine than the webserver ?