Is the action performed, or aborted? You cannot have both.
Who is addressed? An end user, or a server administrator running a proxy server?
In any case, naming a proxy server a proxy server would make up for a less nerdy wording.
URL: https://translatewiki.net/wiki/MediaWiki:Proxy-blocked/en
Please clarify the message documentation, too, since it lacks any information, or else delete it.
URL: https://translatewiki.net/wiki/MediaWiki:Proxy-blocked/qqq