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admin | Category: Phone Book Lookup | 10.02.2016
By looking at the error message, it occurred to me, that may be, we are not setting the correct SSL protocol, which is supported by our PG server. Using SSL Lab’s Analyser, I figured out that our PG server only supports SSL Version 3 and TLS Version 1. Typically, if we don’t specify the SSL version, Curl figures out the supported SSL version and uses that.
The next thing that occurred to me, was may be, the server was picking up a wrong SSL certificate and that might be causing the problem. Looking at Curl’s man pages, I saw an option to resolve the domain name to IPv4 address.
Long story short, it turns out that passing -4 or –ipv4 curl option, forces iPV4 usage and this solved the problem.
However I realized that I could trick the server, by setting my browser’s user agent to IE 7.
Turns out that the 24Online service uses SSL v2 (Secure Sockets Layer 2.0), which of course was deprecated since the collapse of the roman empire. Over the last few years, while building products, I’ve really struggled to keep my users engaged.
Notice that from China its taking 23.34 secs, while from any other country it takes less than 3 secs to load the page.
After cursing The Great Wall; just as we were exploring options for hosting our server inside The Great Wall, we noticed something strange. Hmmm…somehow the content served by our Windows Server is triggering a check inside the Great Wall. Wait a sec….we serve our content via HTTPS, could the Great Wall be looking for keywords inside a HTTPS stream?

May be it has to do with some difference in the headers, since most firewalls look at header info to take decisions. Firewall settings on the Windows Server: It was easy to rule this out, since we had disabled the firewall for all requests coming from our Reverse Proxy Server.
To verify this, we installed Wire Shark on our Windows servers to monitor Reverse DNS Lookup. I found a piece of logging code, which was taking the User IP and trying to find its host name.
On further investigation, I figured that our Windows Server did not have any DNS servers configured for the private Ethernet Interface we were using, while Linux had it.
Eliminated the useless logging code and configured the right DNS servers on our Windows Servers.
If you have your web application running on one tomcat instance and want to add another tomcat instance (ideally on a different machine), following steps will guide you.
Step 1: Independently deploy your web application (WAR file) on each instance and make sure they can work independently. If you don’t see the results as described above, you might want to read my blog on Enabling Multicast.
All MacOS kernel are by default capable of sending and receiving multicast datagrams (packets). When you see MULTICAST against your network interface, it means your kernel is complied with Multicast option and your network interface supports it.
Suddenly I remembered, I could go to the about:config tab in Firefox and poke around there. Also I was surprised how they have figured out the related groups and suggesting those to me.

But then soon we realized the since traceroute and web access (http) uses different protocols, they could use completely different routes to reach the destination. The actual content being served from Windows or Linux servers should be transparent to clients. Have the exact same content served by both Windows and Linux box and see if it made any difference.
When he heard 14 secs delay, he immediately told me that it sounds like a standard Reverse DNS Lookup timeout.
Besides if we did it in our code, both Windows and Linux Servers should have the same delay.
Just out of curiosity, one night, I search our whole code base for any reverse DNS lookup code. On further investigation, we realized that all pages served from our Windows servers were slower by at least 14 secs compared to pages served by our Linux servers. Interestingly the exact same content served from Windows server is still slow by at least 14 secs. Since our application does not have any country specific code, who else could be interfering with this? To check this, we want to pass the session from server 1 to session 2 and see if it increments the counter from where we left.

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