portupgrade without ftp

On my workplace I have restricted ports access. For example, I can't use ftp protocol. But portupgrade use it for some ports. Moreover, it just hangs forever on the fetch stage when it uses ftp. Is there any way to disable ftp tries for port's distfiles fetching?
 
I don't have known ftp proxies on my open network ports. I surely have 80 and 443 ports open, not sure about others.
So, I have to Ctrl+C manually on hanging fetch stage and then search for http resource with needed distfiles to fetch it manually.
 
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