Hi All
I'm trying to get clues to a problem which hit us the other day where
the web server became un-available to browsers suddenly and remained
so for about 17 hours until it was noticed and restarted.
Scenario is:
1] Server is 4D Web Server on 4D Client 2004.5, Windows 2003, Active
4D 4.0.
2] Possibly relevant background info is that when busy (about 50,000
page views per hour) a browser may periodically display the 'can't
open the page ... because could not connect to the server
www.nnnn.com' message. Subsequent browser refreshes are usually
successful after hitting the refresh button a couple of times.
My question is, what is happening when the browser displays this
message ? It 4D Web server returning a 'busy' error to the browser or
just nothing at all ? The message appears very quickly - it doesn't
'look' like the browser is timing out. Are we just seeing the 4D Web
server at it's serving capacity ? Is it sending a 'busy' response
back to the browser or just nothing at all ?
3] Last Saturday, the web server stopped responding altogether - i.e.
'no-one' was getting through and everyone was getting the 'can't open
the page ... because could not connect to the server' message for
about 17 hours. When the web server was restarted it was ok, however
the strange thing is that it hadn't crashed or hung - when we
connected to 4D Client over remote admin, it was quite alive and no
runtime errors or -10003's were visible.
The server ran fine for a month before this and has run fine since.
The hosting company router traffic shows no traffic during the
apparent 'down' period and I'm trying to determine why this happened
and at what point the requests were being blocked.
Any clues sincerely appreciated !
Regards
Peter
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