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squid Version 3.1.11, not transparent

1200 LAN clients surf the web thru the squid server. Browsers' configuration, programmatically pushed to clients, is

http   server:3128
https  ---

On the clients, we access http web sites thru squid, https web sites directly.

Some colleagues tweak their browser' configuration : they set the squid server also on https. So they broke their https surfing.

Question : is there a way to show an error message in this scenario ?

I want to prevent this kind of helpdesk calls !

The goal is to force squid and/or the browser to show a clear error page, like

Your browser configuration isn't correct.
This proxy server only handles HTTP navigation.
share|improve this question
    
Check wiki.squid-cache.org/Features/HTTPS –  ott-- Jan 17 '13 at 19:52
    
ott, thank you for the link, but the hints are to make squid' https working : it isn't our scenario! –  Massimo Jan 18 '13 at 8:44
    
Isn't the timeout the error message? –  ott-- Jan 18 '13 at 9:24
    
If the users configure your proxy for HTTPS browsing, it must work. May be you have something misconfigured in you network or in the proxy. –  diegows Jan 20 '13 at 1:48
    
diegows : The users cannot configure the proxy server, but they can "disrupt" their browsers' configuration. –  Massimo Jan 20 '13 at 15:44

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