Installation Manager 6 error - Failed to login to controller


I started getting an error any time that I try to connect to a controller from Installation Manager. The error reads: "Failed to login to controller. Verify credentials provided in preferences." It doesn't matter what version of RobotStudio I am using or which controller I am connecting to. I can still connect to a controller in RobotStudio as I normally do, Installation Manager just seems to have a problem on my PC. If I use a different PC, the problem isn't there. I can't think of any settings that I changed or versions that I updated. Is anyone else having this issue?