I had this regression also with update-manager. After the following steps, it turned to be working again:
-Set your proxy in "System/Preferences/Network Proxy"
-apply system wide
-In "System/Administration/Synaptic/Settings/Preferences/Network" set your http proxy.
-Reboot
I think the key point here is a reboot ; maybe just a restart of update-manager or Network-manager wuold have been enough.
I had this regression also with update-manager. After the following steps, it turned to be working again:
-Set your proxy in "System/ Preferences/ Network Proxy" Administration/ Synaptic/ Settings/ Preferences/ Network" set your http proxy.
-apply system wide
-In "System/
-Reboot
I think the key point here is a reboot ; maybe just a restart of update-manager or Network-manager wuold have been enough.