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Oracle iPlanet Web Server 7.0.x Reverse Proxy Fails To Notice When An Out-Of-Service Origin Server Restarts and Throws Error HTTP7751 (Doc ID 1344495.1)

Last updated on APRIL 18, 2018

Applies to:

Oracle iPlanet Web Server - Version 7.0 and later
Information in this document applies to any platform.
***Checked for relevance on 20-Jan-2014***

Symptoms

The Web Server is configured to reverse proxy the URI /testpages to two Origin Servers, as shown in the following line from the <vs>-obj.conf:

<Default>
.
.
NameTrans fn="map" from="/testpages" name="reverse-proxy-/testpages" to="http:/testpages"
.
.

<Object name="reverse-proxy-/testpages">
Route fn="set-origin-server" sticky-cookie="JSESSIONID" route-cookie="JROUTE" sticky-param="jsessionid" route-hdr="Proxy-jroute" rewrite-location="true" rewrite-content-location="true" server="origin1:1234" server="origin2:1234"
</Object>


When one of the Origin Servers goes offline, the RP notices this and marks it as offline. This is shown in the error log:

[28/Jul/2011:13:15:46] info ( 6403) vs1-reverse-proxy: for host 1.2.3.4 trying to GET /testpages/index.html, set-origin-server reports: HTTP7751: server origin2:1234 offline


However, when the Origin Server comes back online, it's not noticed by the RP and requests are not directed to this Origin Server.

Cause

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