SECURITY - Sending domain usernames and passwords via http

SECURITY - Sending domain usernames and passwords via http

My network administrator wants me to remove Service Desk because he says sending the users domain username and password over http is completely insecure. Especially when sending that of admin group when setting up domain scans.
Is there a way to enable https? Or must I not use the "domain passwords" feature, but then we would have to setup and administer hundreds of user passwords manually. Any suggestions?

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