Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

We are testing GoDaddy Virtual Data Center and came to a very strange issue when our web site gets unavailable. GoDaddy Support keeps saying the issue is in our web server settings, but looking at the result of our tests I doubt it.


  • Virtual DataCenter with Windows hosted at All servers have Windows Server 2008 R2 Datacenter, IIS 7.
  • Server One with IP address
  • Server Two with IP address
  • Both servers are in private network not visible from outside.
  • Port Forward with IP address Port Forward is assigned to Server One


  • JMeter is used as a Client App to simulate 30 concurrent users sending 100 SOAP requests each. Interval between requests is 1 second.
  • Http link used for testing:


  • Test is run from a computer in our office.
  • After JMeter starts running test, almost immediately, the link above becomes unavailable in a browser.
  • After test completion, the link is not available in a browser for about 5 more minutes.
  • Remote Desktop is working well, so we can connect to Server One remotely.
  • After about 5 minutes since test completion, the link becomes available in a browser again.


  • Test is run from Server Two (that is part of our virtual data center).
  • Test works very well, no visible delays in processing.
  • The link is available in a browser all the time.


  • Test is run from Server One using localhost.
  • The result is the same as in TEST TWO - no issues.


We repeated TEST ONE from other computers that we have located in different countries, all with the same result as TEST ONE.


As the test works well from Server Two, but does not work from outside our virtual data center, we feel there are issues with the network or its capacity. The whole behaviour looks like out requests from outside get stuck somewhere before reaching our virtual data center.

Has anybody had similar issues in the past? Are there chances that something is wrong with our server settings?

share|improve this question
up vote 0 down vote accepted

maybe it's DDOS protection, as all traffic come through same ip during jmeter test.

Do a wireshark trace on server One to see if your ip is still reaching server when broken. Even with iis stopped, you must see incoming tcp request to the web server port

share|improve this answer
I guess in this case the link would not be available from the client machine only, but it gets unavailable from other client machines too. Thanks for wireshark advise, will check it. – Roman Apr 7 '12 at 16:15
@roman it's the public ip that get blocked, so i agree if you tested from others internet access – Mathieu Chateau Apr 7 '12 at 16:19
Also check event log for Application pool crash, just in case of – Mathieu Chateau Apr 7 '12 at 16:20
@ Mathieu Chateau: do you mean that ip gets blocked? By whom, our Internet Provider? – Roman Apr 7 '12 at 16:41
As you tested from different place on the world, your ISP is not guilty for me. So Godaddy may be blocking your internet public ip from where your launch jmeter – Mathieu Chateau Apr 7 '12 at 16:51

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.