Yes it is a IIS issue. and i think i just solve it. I increase the "Max number of Worker Processes" from 1 to 3 in the Default Application Pool. and it works.
It will not prompt for authentication immediately anymore, but will just try to serve the page when the cpu is not 100%. I should say that the web application is very SQL intensive. If the application makes a large number of long blocking calls (e.g. long SQL/Oracle Queries), more worker processes will help (assuming that the backend can handle the connection load). > From: dbl...@dblock.org > To: users@tomcat.apache.org > Date: Wed, 21 Jul 2010 09:41:10 -0400 > Subject: RE: isapi_redirect.dll fail in SSO on high cpu load > > I am going to guess that some policy in Windows rejects the high volume of > logons, too many connections or something of that kind. It's most likely not > a Tomcat problem. Andre suggestions are pretty good in terms of isolating it. > I would start by stressing IIS alone with a static page in it. > > Since you're running on Windows, you might as well get rid of IIS and replace > it with a Waffle filter - http://waffle.codeplex.com. > > dB. @ dblock.org > Moscow|Geneva|Seattle|New York > > > > -----Original Message----- > From: Yun Feng Chua [mailto:yf_c...@hotmail.com] > Sent: Wednesday, July 21, 2010 3:07 AM > To: users@tomcat.apache.org > Subject: isapi_redirect.dll fail in SSO on high cpu load > > > Hi, > > Currently using Tomcat 5.5 and isapi_redirect.dll 1.2.14 in IIS 6.0 > Configure with IIS integrated authentication for SSO. > > Notice that under high cpu load in the server, 100% util, the website prompt > for authentication. > When the cpu load subsided, the SSO is working. > > Any ideas why it prompt for authentication under heavy cpu load? > > > > thank you > > yun feng, chua > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org >
