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"Error negotiation SSL-Connection" with ssl_bump enabled and the impact of "sslproxy_cipher"

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Hi

Using latest squid 3.4.4 with ssl_bump.

With ssl_bump enabled, I receive an error in cache.log (and the
browser too) while opening the page
'https://www.pubservice.com/Subnew2page.aspx?PC=LJ':

fwdNegotiateSSL: Error negotiating SSL connection on FD 67:
error:00000000:lib(0):func(0):reason(0) (5/-1/104)

I have found two workarounds:
1) Find out, which encryption the SSL-connection is using (curl -s -v
-I -k "https://www.pubservice.com/Subnew2page.aspx?PC=LJ";) and search
for "SSL connection using RC4-SHA".
1a) Define 'sslproxy_cipher RC4-SHA' in squid.conf and reload squid

2) Deny ssl_bump for the site mentioned above.

Question:
What encryption types does squid allow per default in sslproxy_cipher?
Why do I need to extend the sslproxy_cipher-directive in some
circumstandes? Why is this site not working with ssl_bump enabled and
the default "sslproxy_cipher"?


Thanks a lot.
Tom




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