View source for Connection failure to websites


= <span class="mw-headline" id="Issues">Issues</span> =

#When I access website, it is displaying connection fail error “'''Connection to 192.168.27.30:80 failed'''” 
#When I access [https://login.microsoftonline.com/ https://abc.safesquid.com/]&nbsp;&nbsp;via proxy and login using my corporate email ID, it is displaying connection fail error “'''Connection to abc.safesquid.com:443 failed'''” 

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= <span class="mw-headline" id="Root_Causes">Root Causes</span> =

#If the website which you are trying to reach is not up 
#If you unable to reach to the particular website because of internet slowness issue. 

== <span class="toctext">Troubleshooting</span> ==

<u>'''<span class="toctext">Case1:</span>'''</u>

<span class="toctext">Check whether the website is opening without proxy configuration inside browser ( No proxy in the middle).</span>

<span class="toctext">If the website is not opening without proxy, then it is not the problem with SafeSquid.</span>

<span class="toctext">If it is opening without proxy, then </span>Run below command to verify whether the website is resolving or not.
<div style="background:#eee;  border:1px solid #ccc;  padding:5px 10px">
'''Command:'''&nbsp; nslookup 192.168.27.30
</div> 
<code>'''To check SafeSquid server is connecting to&nbsp;'''</code>192.168.27.30 on port 80
<div style="background:#eee;  border:1px solid #ccc;  padding:5px 10px">
<code>'''Command: telnet <WEBSITE> <PORT_TO_CONNECTON>'''</code>&nbsp;
</div> 
you will get this output if the website is not able to connect
<div style="background:#eee;  border:1px solid #ccc;  padding:5px 10px">
telnet 192.168.27.30 80<br/> Trying 192.168.27.30...<br/> telnet: Unable to connect to remote host: No route to host
</div> 
If the website is able to connect you will get below output

'''<code>telnet <WEBSITE> <PORT_TO_CONNECTON></code>'''

you will get this output if the website is not able to connect&nbsp;:
<div style="background:#eee;  border:1px solid #ccc;  padding:5px 10px">
<code>'''Command:'''</code>telnet 192.168.27.30 80
</div> 
you will get this output if the website is&nbsp;able to connect
<div style="background:#eee;  border:1px solid #ccc;  padding:5px 10px">
root@dev:~# telnet 192.168.27.30 80<br/> Trying 192.168.27.30...<br/> Connected to 192.168.27.30.<br/> Escape character is '^]'.
</div> 
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'''<u>Case 2</u>:''' If you have'''&nbsp; '''server with'''&nbsp;'''on-premises environment integrated with directory services. DNS resolution is done by directory DNS server.

To check&nbsp;configuration on local internal network and its address record pointed on active directory(AD) or local DNS server

Run below commands on command prompt for '''abc.safesquid.com'''
<div style="background:#eee;  border:1px solid #ccc;  padding:5px 10px">
'''Command:'''&nbsp; nslookup abc.safesquid.com
</div> 
If the website&nbsp;is resolving to the local internal network '''e.g.'''&nbsp;(10.10.11.78,10.10.128.106)

You have to do the conditional forwarding to safesquid local caching DNS server

Go to the path&nbsp;:&nbsp;'''/etc/bind/'''

and create a file
<div style="background:#eee;  border:1px solid #ccc;  padding:5px 10px">
'''Command:''' vim named.conf

root@swg:/etc/bind# vim named.conf

// This is the primary configuration file for the BIND DNS server named.

//

// Please read /usr/share/doc/bind9/README.Debian.gz for information on the

// structure of BIND configuration files in Debian, *BEFORE* you customize

// this configuration file.

//

// If you are just adding zones, please do that in /etc/bind/named.conf.local

&nbsp;

include "/etc/bind/named.conf.options";

include "/etc/bind/named.conf.local";

include "/etc/bind/named.conf.default-zones";

include "/etc/bind/safesquid.dns.conf";

include "/etc/bind/abc.safesquid.com";
</div> 
Go to the path
<div style="background:#eee;  border:1px solid #ccc;  padding:5px 10px">
'''Command:''' cd /etc/bind/
</div> 
&nbsp;And create a file
<div style="background:#eee;  border:1px solid #ccc;  padding:5px 10px">
'''Command:''' vim abc.safesquid.com
</div> 
Add below lines
<div style="background:#eee;  border:1px solid #ccc;  padding:5px 10px">
zone "abc.safesquid.com" {

&nbsp;&nbsp; type forward;

&nbsp;&nbsp; forwarders { 10.10.124.101; };

};
</div> 
Command to restart bind9 service:
<div style="background:#eee;  border:1px solid #ccc;  padding:5px 10px">
<code>'''Command:'''</code>/etc/init.d/bind9 restart
</div> 
verify whether the website is resolving to the local IP successfully or not.

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