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<p class="MsoNormal">Hello Squid users, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m running into an issue wherein, when using Squid proxy, I’m unable to get to one of our management devices from port 4434.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve already verified that this device is not blocking access from the proxy directly, and should be allowed to get to the access page.
<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>When reviewing the access logs, I can see that we’re running into a generic 503 error<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>When browsing to this page, it will attempt to load for about 30 seconds, and then fail<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>The webpage response is a generic “The system returned: <i>
(110) Connection timed out” </i><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>When we forgo the proxy, we can access it without an issue<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This device is located on a 172.0.0.0/8 internal network. <o:p>
</o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Other devices which do NOT use this port are accessible<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Changing the access port is not an option (not up to me) <o:p>
</o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Access Log entry:<o:p></o:p></p>
<p class="MsoNormal">09/Oct/2024:15:54:21 -0400.758 10.46.49.190 TCP_MISS/503 4448 GET http://172.27.46.253:4434/ jpiana \ HIER_DIRECT/172.27.46.253 text/html ERR_CONNECT_FAIL/WITH_SERVER<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please see below for relevant squid.conf rules: <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">auth_param basic program /usr/lib64/squid/basic_pam_auth<o:p></o:p></p>
<p class="MsoNormal">auth_param negotiate children 10<o:p></o:p></p>
<p class="MsoNormal">auth_param negotiate keep_alive on<o:p></o:p></p>
<p class="MsoNormal">auth_param basic credentialsttl 1 week<o:p></o:p></p>
<p class="MsoNormal">acl kerb-auth proxy_auth REQUIRED<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">acl src_self src 10.46.11.69 # proxy IP Address<o:p></o:p></p>
<p class="MsoNormal">acl localnet src 10.0.0.0/8 # hexcel networks<o:p></o:p></p>
<p class="MsoNormal">acl localnet src 172.0.0.0/8 # internal management network<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">acl SSL_ports port 443<o:p></o:p></p>
<p class="MsoNormal">acl Safe_ports port 21 # ftp<o:p></o:p></p>
<p class="MsoNormal">acl Safe_ports port 22 # ssh<o:p></o:p></p>
<p class="MsoNormal">acl Safe_ports port 80 # http<o:p></o:p></p>
<p class="MsoNormal">acl Safe_ports port 443 # https<o:p></o:p></p>
<p class="MsoNormal">acl Safe_ports port 4434 # firewall management port
<o:p></o:p></p>
<p class="MsoNormal">acl Safe_ports port 8080 # http alternative<o:p></o:p></p>
<p class="MsoNormal">acl Safe_ports port 8443 # https alternative<o:p></o:p></p>
<p class="MsoNormal">acl Safe_ports port 1025-65535 # unregistered ports<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"># deny requests to certain unsafe ports<o:p></o:p></p>
<p class="MsoNormal">http_access deny !Safe_ports<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"># deny CONNECT to other than secure SSL ports<o:p></o:p></p>
<p class="MsoNormal">http_access deny CONNECT !SSL_ports<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"># only allow cachemgr access from localhost<o:p></o:p></p>
<p class="MsoNormal">http_access allow localhost manager<o:p></o:p></p>
<p class="MsoNormal">http_access deny manager<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"># this only allows changes to be made on the host itself <o:p>
</o:p></p>
<p class="MsoNormal">http_access allow localhost<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"># keep this deny here because other ACL's may unintentionally allow access<o:p></o:p></p>
<p class="MsoNormal">http_access deny to_localhost<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"># allow safe ports to CONNECT<o:p></o:p></p>
<p class="MsoNormal">http_access allow Safe_ports<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"># allow localnet parameter to CONNECT<o:p></o:p></p>
<p class="MsoNormal">http_access allow localnet<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"># allow authenticated users<o:p></o:p></p>
<p class="MsoNormal">http_access allow kerb-auth<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"># deny any request we missed in the above<o:p></o:p></p>
<p class="MsoNormal">http_access deny all<o:p></o:p></p>
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