Difference between proxy server and reverse proxy server

What is the difference between proxy server and reverse proxy server?…


How do I maintain PHP sessions across multiple domains on the same server?

I am looking for a way to maintain PHP sessions across multiple domains on the same server. I am going to be integrating my sites with a Simple Machines Forum so I will need to use MySQL based sessio…



How to I dynamically set the expiry time for a cookie-based session in Rails

I'm currently using the ActiveRecord-based session store for my Rails app and I have a background process which clears out inactive sessions every 30 minutes. I'd like to switch to Rails' new cookie-…


Load Balancing in Amazon EC2?

We've been fighting with HAProxy for a few days now in Amazon EC2; the experience has so far been great, but we're stuck on squeezing more performance out of the software load balancer. We're not exac…


Ruby on Rails scalability/performance?

I have used PHP for awhile now and have used it well with CodeIgniter, which is a great framework. I am starting on a new personal project and last time I was considering what to use(PHP vs ROR) I us…


Should I ignore the occasional Invalid viewstate error?

Every now and then(once every day or so) we're seeing the following types of errors in our logs for an ASP.NET 3.5 application Invalid viewstate Invalid postback or callback argument Are these som…


benchmarking - Load Testing with AB … fake failed requests(length)

To do some load testing, for my own curiosity, on my server I ran: ab-kc 50-t 200 http://localhost/index.php This opens up 50 keep-alive connections for 200 seconds and just slams my server with re…


Invalid viewstate error

I'm getting an invalid viewstate error with regard to the ScriptResource.axd. Just wondering if anyone of you could help me on this. Error is: 2009-02-24 09:46:30,021[13] DEBUG ASP.global_asax[(nul…


In ASP.Net, I sometimes get the following error-Viewstate verification failed. Reason: The viewstate supplied failed integrity check

Background: I developed a web app in ASP.Net 3.5 in C#. It runs great but now a few users have reported that they recieve an error sometimes. I have tried to duplicate the error but it has been ha…


security - How to handle ssh host key verification with 2 different hosts on the same(but changing) IP address?

I have 2 ssh servers behind a nat firewall at a location that changes its wan IP every day. They are always at the same wan IP address on a given time but on different ports. I am connecting to server…




load aws application elb nginx not ec2 balancing ssl elastic