407 error is proxy authentication required. You should talk to your system admin about this.
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It seems that it is connecting through a proxy which requires
authentication, but hasn't been set up provide any authentication. This
is straining the length of my knowledge on the subject of proxies. I'm
not even sure if this is a server configuration issue or a script issue.
If this can be solved script side someone else will have to help you as
I don't know the plugin you are using.
Dom