Date: Thu, 14 Oct 2004 11:28:16 -0600 From: "Stephane Raimbault" <segr@hotmail.com> To: gnn@FreeBSD.org Cc: net@FreeBSD.org Subject: Re: Error 49, socket problem? Message-ID: <BAY24-F29fqR77bieLY0001b6c1@hotmail.com>
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>From: gnn@FreeBSD.org >To: "Stephane Raimbault" <segr@hotmail.com> >CC: net@FreeBSD.org >Subject: Re: Error 49, socket problem? >Date: Thu, 14 Oct 2004 10:46:58 +0900 > >At Wed, 13 Oct 2004 09:36:03 -0600, >Stephane Raimbault wrote: > > > > I doubt it's a DoS attack, however it could very well be. > > > >Well, probably not, given what you told us below. > > > In this particular setup, apache runs on port 80 and 81. A slimed down > > version of apache handles basic http requests on port 80 and on port 81, >we > > have a beefier version of apache with php running applications. We >proxy > > the request from port 80 to port 81 so the client only ever sees >connections > > to port 80. > > > > What I find strange is other applications on the server freak out when >this > > is happening in the same manner. such as php not able to make mysql > > connections with a similar error. The errors aren't limited to >127.0.0.1 > > either, it seems to be an overall problem with the box, not specifically >the > > loopback or apache. > > > > PHP Warning: mysql_connect(): Can't connect to MySQL server on > > 'dbm.xxx.xxx.com' (49) in /www/index.php on line 4060 > > > > In this case the above dbm.xxx.xxx.com resolves to 10.0.12.22 which is >one > > of the MySQL server's in the cluster. > > > > I've ruled out that it's a problem with the MySQL server in this case, > > because I have 4 other web servers (running apache) able to connect to >that > > MySQL server during the same time. All web servers in this cluster seem >to > > exhibit the error randomly at diffrent times. Not only during high peak > > traffic times as previously thought. > > > > Are there buffers I could be running out of? What should I be checking? > > Perhaps something in sysctl... If I know what I should probably be >looking > > at, I can probably monitor and have certain variables logged / graphed >for a > > better idea of what is going on. > > > >What version of FreeBSD are you running? > % uname -r 4.9-RELEASE-p11 >I would check the interfaces (ifconfig -a), routing table (netstat >-rn), and then the rest of the network statistics (man netstat) when >this happens. Does it happen reliably or intermittently? > I will see if I can write a script that can be triggered when the errors occur. The errors are randomly intermittent. >Later, >George Thanks, Stephane. _________________________________________________________________ Take charge with a pop-up guard built on patented Microsoft® SmartScreen Technology http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=http://hotmail.com/enca&HL=Market_MSNIS_Taglines Start enjoying all the benefits of MSN® Premium right now and get the first two months FREE*.
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