[LINK] Webserver unavailability patterns
Thu, 03 Oct 2002 10:15:51 +1000
At 08:22 AM 03-10-2002 +1000, Jan Whitaker wrote:
>Have any other linkers noticed an increase in unavailable websites? Just
>now I've been trying to do a bpay and the westpac site stopped
>responding. Then to see if it was just them, I tried ABC.net.au/news -
>also not responding. Then I tried another .au site and it came up just
>fine, as did a US based .com site. I've even closed and reopened the
>browser to be sure it wasn't hung up.
Quite some time ago I found that the National Library http://www.nla.gov.au became unavailable. A recent email to NOIE, who I believe host NLA, elicited the helpful response "It works for me. Why don't you try again?"
Recently I noticed ASIC http://www.asic.gov.au had disappeared, and a few weeks ago I found the Australian Catholic University http://www.acu.edu.au had gone over the horizon.
This resulted in a call to my ISP, Dot Communications, and some diagnostic work by moi. If I attempt to access www.nla.gov.au from the browser and then run 'netstat -r www.nla.gov.au' from a DOS window, the part of the display showing active TCP connections shows an outbound connection to 'www-prod.nla.gov.au:80' in state 'SYN_SENT' which indicates the browser has successfully resolved the server name and initiated a TCP connection to port 80, but hasn't received a TCP response. However if I configure the browser to use Dot's proxy server instead of a "direct connection to the Internet" everything works just fine.
I'm using the Netscape V4.77 browser, but Mozilla V1.1 shows the same results. Forcing the browser to use the HTTP secondary port '8080' doesn't change anything (as one would hope!).
You might also try using TRACEROUTE from a DOS window, for example 'tracert www.nla.gov.au' A working site will respond like this:
Tracing route to boomer.anu.edu.au [220.127.116.11]
over a maximum of 30 hops:
1 144 ms 130 ms 127 ms acc02-kent-syd.comindico.com.au [18.104.22.168]
2 129 ms 124 ms 128 ms 22.214.171.124
3 131 ms 125 ms 121 ms ge6-1.cor01-syd.comindico.com.au [126.96.36.199]
4 330 ms 281 ms 266 ms ge5-0-0.bdr01-kent-syd.comindico.com.au [188.8.131.52]
5 128 ms 125 ms 124 ms ATM-4-0-0-1.sn2.optus.net.au [184.108.40.206]
6 151 ms 143 ms 145 ms Gi5-0.cn1.optus.net.au [220.127.116.11]
7 148 ms 147 ms 147 ms ACT-RNO-Dom.cn1.optus.net.au [18.104.22.168]
8 151 ms 146 ms 147 ms anu-huxley.carno.net.au [22.214.171.124]
9 156 ms 157 ms 153 ms boomer.anu.edu.au [126.96.36.199]
I'd be really interested to hear the results, as Dot seem to have dropped the ball. I suspect a problem in the underlying network.
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