Server Error, unable to connect to fastcgi server. [No Viruses detected]

Mon Nov 20 10:44:23 EST 2006

Hi Trevor

I think it has made a difference, but would not like to swear to it yet.

Thanks for the help

Tom

Trevor Wekel wrote:
> 
> Hi Tom,
> 
> Increasing these registry values may help.  I have not debugged the
> fastcgi teardown/startup in detail to see exactly what happens.  As
> such, I cannot make any guarantees.  But this is likely one of the few
> configuration settings which may have an impact.
> 
> If it does help, please let us (the list) know.
> 
> Thanks,
> Trevor 
> 
> -----Original Message-----
> From: Tom Chadwin [mailto:tom.chadwin at nnpa.org.uk] 
> Sent: Thursday, November 16, 2006 4:21 AM
> To: users at mapguide.osgeo.org
> Subject: RE: [mapguide-users] Server Error, unable to connect to fastcgi
> server. [No Viruses detected]
> 
> Hi Trevor
> 
> Many thanks for the detailed explanation. Without wishing to sound
> ungrateful, can you help me out with ways to alleviate the symptom? I've
> tried upping the values of the FastCGI registry keys STARTSERVERS and
> INCREMENTSERVERS. Is this likely to help?
> 
> Thanks again
> 
> Tom
> 
> 
> 
> 
> Tom Chadwin
> ICT & Web Development Officer
> Telephone: 01434 611530
> Mobile: 
> Fax: 01434 611677
> Email: tom.chadwin at nnpa.org.uk
> Web : www.Northumberland-national-park.org.uk
> <http://www.Northumberland-national-park.org.uk>
> 
> <http://www.northumberland-national-park.org.uk/> 
>  
> ________________________________________________________________________
> ____
> IMPORTANT NOTICE - Disclaimer - November 16, 2006 - REF
> Email-200611-00045831.
> 
> If you have received this e-mail in error or wish to read our e-mail
> disclaimer statement and monitoring policy, please refer to the
> statement below or contact the sender. 
> This communication is from Northumberland National Park Authority
> (NNPA).The Authority's head office and principal place of business is
> Eastburn, South Park, Hexham, Northumberland, NE46 1BS, United
> Kingdom.This communication and any attachments contain information which
> is confidential and may also be privileged. It is for the exclusive use
> of users at mapguide.osgeo.org. If you are not the intended recipient(s)
> please note that any form of disclosure, distribution, copying or use of
> this communication or the information in it or in any attachments is
> strictly prohibited and may be unlawful. If you have received this
> communication in error, please return it with the title "received in
> error" to "it.security at nnpa.org.uk" then delete the email and destroy
> any copies of it. 
> E-mail communications cannot be guaranteed to be secure or error free,
> as information could be intercepted, corrupted, amended, lost,
> destroyed, arrive late or incomplete, or contain viruses. We do not
> accept liability for any such matters or their consequences. Anyone who
> communicates with us by e-mail is taken to accept the risks in doing so.
> 
> Any views or opinions presented are solely those of the author and do
> not necessarily represent those of NNPA.Contractors or potential
> contractors are reminded that a formal Order or Contract is needed for
> NNPA to be bound by any offer or acceptance of terms for the supply of
> goods or services Although this email and any attachments are believed
> to be free of any virus or other defects which might affect any computer
> or IT system into which they are received, no responsibility is accepted
> by the NNPA for any loss or damage arising in any way from the receipt
> or use thereof. Computer systems of this Authority may be monitored and
> communications carried out on them recorded, to secure the effective
> operation of the system and for other lawful purposes.
> -----Original Message-----
> From: Trevor Wekel [mailto:trevor.wekel at autodesk.com]
> Sent: 15 November 2006 19:42
> To: Chris Gountanis; users at mapguide.osgeo.org
> Subject: RE: [mapguide-users] Server Error, unable to connect to fastcgi
> server. [No Viruses detected]
> 
> Hi Chris, Hi Tom,
> 
> MapAgent.exe and php-cgi.exe are both CGI and FastCGI applications.
> They can be configured to function as standalone CGI apps or as longer
> lifetime FastCGI apps.  As part of the performance optimization for
> MapGuide we chose to use FastCGI.
> 
> When configured as regular CGI apps, process loading and initialization
> becomes a significant part of the execution time.  For PHP, the entire
> API definition of approximately 130 classes and 1400 methods has to be
> registered with the PHP runtime.  This is lot of memory allocation and
> initialization.  The Mapagent loads/initializes faster but it still
> takes time.  Incurring 200+ milliseconds of overhead for a 10
> millisecond HTTP request was very performance restrictive.
> 
> Mapagent.exe and php-cgi.exe also connect to MapGuide Server through
> TCP/IP.  When run as regular CGI's, these processes can exhaust the
> ephemeral ports on both Windows and Linux.  From what I remember, the
> default port pool on Windows is around 3000 ports and they stay in a
> TIME_WAIT state for 4 minutes after they are closed.  A request rate of
> around 12 requests per second for 4 minutes is sufficient to completely
> exhaust the ephemeral ports on the server.  Once this happens, no new
> TCP/IP connections will be accepted for any process running on the
> machine.  Under some of our internal load tests, I could force this
> condition in about 30 seconds.  When run as FastCGI apps, the Mapagent
> and php-cgi reuse existing connections to the server which completely
> avoids this problem. 
> 
> Isapi_fcgi.dll is an IIS extension for handling FastCGI applications.
> With the default setups, both Mapagent.exe and php-cgi.exe run under
> this IIS extension.  The Mapagent.fcgi file is just a placeholder.  It
> makes it easier to configure either a FastCGI or regular CGI Mapagent
> without having to change any URLs.  For FastCGI, Mapagent.fcgi redirects
> to isapi_fcgi.dll which then calls a running mapagent.exe process.  For
> regular cgi mapagent.fcgi just redirects to mapagent.exe.
> 
> 
> It is possible to configure the Mapagent and php-cgi.exe as regular CGI
> apps.  Initially, MapGuide was configured that way.  But there will be a
> performance hit and the default settings for TCP/IP may need to be
> adjusted to avoid ephemeral port exhaustion.
> 
> 
> Thanks (for reading all this),
> 
> Trevor
>  
> 
> -----Original Message-----
> From: Chris Gountanis [mailto:cgountanis at mpower-tech.com]
> Sent: Tuesday, November 14, 2006 10:50 AM
> To: users at mapguide.osgeo.org
> Subject: RE: [mapguide-users] Server Error, unable to connect to fastcgi
> server. [No Viruses detected]
> 
> With that being said is there a better way to setup the IIS/PHP config
> in IIS. I was told be a few people that they had to change the PHP and
> FCGI handlers manually after the fact. Why are PHP pages handled with
> the isapi_fcgi.dll file and not the php-cgi.exe file? What is the big
> diff from using mapagent.fcgi or using MapAgent.exe directly. What is
> the fcgi file actually redirecting to?
> 
> 
> --
> Chris
> 
> -----Original Message-----
> From: Tom Chadwin [mailto:tom.chadwin at nnpa.org.uk]
> Sent: Tuesday, November 14, 2006 11:37 AM
> To: users at mapguide.osgeo.org
> Subject: [mapguide-users] Server Error, unable to connect to fastcgi
> server.
> [No Viruses detected]
> 
> Hello all
> 
> I get the following error message intermittently in my W2K3/IIS/PHP
> application:
> 
> Server Error, unable to connect to fastcgi server.
> 
> A refresh often gets rid of the problem. I can't find anything in the
> Windows event logs. Can anyone point me towards finding the cause of
> this problem?
> 
> Thanks
> 
> Tom
> 
> 
> 
> Tom Chadwin
> ICT & Web Development Officer
> Telephone: 01434 611530
> Mobile: 
> Fax: 01434 611677
> Email: tom.chadwin at nnpa.org.uk
> Web : www.Northumberland-national-park.org.uk
> <http://www.Northumberland-national-park.org.uk>
> 
> <http://www.northumberland-national-park.org.uk/> 
>  
> ________________________________________________________________________
> ____
> IMPORTANT NOTICE - Disclaimer - November 14, 2006 - REF
> Email-200611-00045249.
> 
> If you have received this e-mail in error or wish to read our e-mail
> disclaimer statement and monitoring policy, please refer to the
> statement below or contact the sender. 
> This communication is from Northumberland National Park Authority
> (NNPA).The Authority's head office and principal place of business is
> Eastburn, South Park, Hexham, Northumberland, NE46 1BS, United
> Kingdom.This communication and any attachments contain information which
> is confidential and may also be privileged. It is for the exclusive use
> of users at mapguide.osgeo.org. If you are not the intended recipient(s)
> please note that any form of disclosure, distribution, copying or use of
> this communication or the information in it or in any attachments is
> strictly prohibited and may be unlawful. If you have received this
> communication in error, please return it with the title "received in
> error" to "it.security at nnpa.org.uk" then delete the email and destroy
> any copies of it. 
> E-mail communications cannot be guaranteed to be secure or error free,
> as information could be intercepted, corrupted, amended, lost,
> destroyed, arrive late or incomplete, or contain viruses. We do not
> accept liability for any such matters or their consequences. Anyone who
> communicates with us by e-mail is taken to accept the risks in doing so.
> 
> Any views or opinions presented are solely those of the author and do
> not necessarily represent those of NNPA.Contractors or potential
> contractors are reminded that a formal Order or Contract is needed for
> NNPA to be bound by any offer or acceptance of terms for the supply of
> goods or services Although this email and any attachments are believed
> to be free of any virus or other defects which might affect any computer
> or IT system into which they are received, no responsibility is accepted
> by the NNPA for any loss or damage arising in any way from the receipt
> or use thereof. Computer systems of this Authority may be monitored and
> communications carried out on them recorded, to secure the effective
> operation of the system and for other lawful purposes.
> 
> 
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