I had a strange problem a couple of days ago; and it had hit me right at the time when I would have least wanted it to!!! Just till 20 minutes before the problem, I had prepared for a corporate presentation over the internet (through webex); Had installed the required component in Firefox, had a colleague walk me through how to host a presentation, etc.
But when the time came to actually log in and start the presentation, I could not connect to the site!!! I could have understood it if it had been my network failing me... but it was working fine!! I was able to browse a few sites, Google, GMail, Google docs, licofindia.com, and a few others that I cared to check.
And the strange thing was that there were a few sites I wasn't able to browse: webex.com, snapfish.com, kotaksecurities.com, and the list grew in the next 24 hours that I waited for the problem to solve itself.
The worst part was that I was totally cut-off from my corporate network!!! no mails.. even the web-interface of our mailing system vanished from the face of internet-earth! enterprisedb.com, mail01.enterprisedb.com .. everything failed!!
My colleague devised a workaround and helped me to somehow conduct the presentation, and we were able to save face.
I waited for the rest of the day for the problem to go away, and in the meantime I noticed more and more sites that were not accessible.
Next day I researched a lot about the problem. I used these keywords to search (the ping and tracert messages)
Ping request could not find host
Unable to resolve target system name
I tried quite a lot of results but nothing helped. Finally I started doubting the least suspected culprit: the DNS servers.
To cut the long story short, I changed the primary DNS server to 18.104.22.168 and moved my old primary DNS server to the 'Alternate DNS Server' box. And presto, everything was back to normal.
I guess it was some local problem; or maybe stale record on the DNS. I donno, I am no expert on this.
This is my setup:
OS: Windows XP SP2
ISP: BSNL Hyderabad
Router: Type II (from UTStarComm).
I got this DNS address from http://www.appaji.net/get/dataone/bdah.html
; hope it helps someone else in desperate times.
BSNL DNS Servers: