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Re: Fwd: [Squid-3.5.20]Squid transparent proxy http/https without client site config

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On 30/11/17 01:34, minh hưng đỗ hoàng wrote:
Dear Amos,
Sorry for concluded hurriedly.
When i do a test with 1 user, it's seem ok, no more Aler from cache.log. But when i test with more users, the Alert log from cache.log happen again. And so i can't access some https page as chatwork.com , facebook.com.


You are understanding that this is a log entry that cannot be completely removed right? the problem can only be reduced in how much damage is done, not fixed.

Also be aware that the cache.log records every security event. Even when the user does not see anything unusual because Squid sends them transparently to the server they were trying to contact as if the proxy was not there (real transparency).

You seem to be doing everything that can be done about the connectivity issues related to that log message.


I suspect that any remaining issues you are now having with those HTTPS sites is a separate problem with the Squid-3 SSL-Bump code or TLS protocol itself. You need to take a closer look at the exact transactions that are going on with those remaining problem sites.

If the problem turns out to be anything in the TLS protocol messages the 'splice' action that your Squid is currently doing means that type of problem has nothing to do with Squid. It is the client and server endpoints having the issue between themselves.

You could also try out Squid 3.5.27 or Squid-4 code for a more up to date SSL-Bump implementation. There are a few changes to how the connection management works that might show up as weird problems in Squid-3 despite the splice. Even the 7 months between your 3.5.20 and 3.5.27 has a few of those.

Amos
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