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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 30722] New: - ProxyPass results in an occasional DNS lookup failure
Date Wed, 18 Aug 2004 10:07:00 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=30722

ProxyPass results in an occasional DNS lookup failure

           Summary: ProxyPass results in an occasional DNS lookup failure
           Product: Apache httpd-2.0
           Version: 2.0.50
          Platform: Sun
        OS/Version: Solaris
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: mod_proxy
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: apachebugzilla@mikecorlett.com


Using ProxyPass and ReverseProxyPass within a virtual host to pass on all
traffic to an internal webserver ( Apache 1.3 for Oracle Application Server ).
Roughly 1 in 10 requests, be it for pages or images, result in ;

Proxy Error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET
/pls/pls/portal/url/page/blahblahblah

Reason: DNS lookup failure for: test.myservernamewashere.com

----

Debug log looks like ;

[Wed Aug 18 10:43:21 2004] [debug] mod_cache.c(157): cache: no cache - add
cache_in filter and DECLINE
[Wed Aug 18 10:43:21 2004] [debug] proxy_http.c(66): proxy: HTTP: canonicalising
URL //test.myservernamewashere.com/pls/pls/portal/url/page/blahblahblah
[Wed Aug 18 10:43:21 2004] [debug] mod_proxy.c(416): Trying to run scheme_handler
[Wed Aug 18 10:43:21 2004] [debug] proxy_http.c(1073): proxy: HTTP: serving URL
http://test.myservernamewashere.com/pls/pls/portal/url/page/blahblahblah?menu=m1open
[Wed Aug 18 10:43:21 2004] [debug] proxy_http.c(185): proxy: HTTP connecting
http://test.myservernamewashere.com/pls/pls/portal/url/page/blahblahblah?menu=m1open
to test.myservernamewashere.com:80
[Wed Aug 18 10:43:21 2004] [error] [client 81.144.201.222] proxy: DNS lookup
failure for: test.myservernamewashere.com returned by
/pls/pls/portal/url/page/blahblahblah, referer:
http://test.myservernamewashere.com/portal/page?_pageid=53,393023&_dad=portal&_schema=PORTAL

------

Notes ;
Mod cache ( memory ) is enabled.
We're not using a DNS server, just /etc/hosts, on Sparc Solaris 9
We're using name based virtual hosts, not ip addressed based
The internal server has the same virtual hostname as the external virtual hostname.
Full apache config available on request.

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