Thats weired.
So assuming you have Windows Authentication.
Do you have only one machine? or cluster of of machines (RIM nodes)?
either way i am guessing there might be something wrong with your proxy or certificates. try one of these and let me know.
1. RDP to sense server and go to HUB --> it will show unsigned cert message,etc.. bypass that and enter the credentials.
2. if above works, then it might be something to with certificates. to solve this restarting services should resolve, if not do below.
-- stop all Qlik services.
-- delete the certificates
-- Run --> MMC
-- CTRL+M (or File --> Add/Remove Snap-in) --> Double click Certificates --> My User Account
-> Double click Certificates --> Computer Account --> Click OK
-- Certificates --> Current User --> Personal --> Certificates --> Delete QlikClient Certificate
Usually this is the only place you will have this QlikClient Certificate, but check in below places as well
Certificates --> Current User -->Trusted Root Certificates
Certificates --> Local Computer -->Personal
Certificates --> Local Computer -->Trusted Root Certificates
--- Restart all services. this should recreate the "QlikClient" certificate automatically.
3. Also check if you are using your company Certificate then see if that is not expired. it recides in above locations.
try these and let me know.
