Hi Dan,
I was doing some test with my Collection Extention (MW 1.19.1) and I got 
exactly your same error (*The POST request to **
http://mwrender.servername:8899/* <http://mwrender.servername:8899/>* failed 
($2).) *when I stopped my mw-serve daemon. So are you shure the mw-serve is 
up & running ? Check (netstat -an | grep 8899) if your mw-serve is running 
on right port.
 
Bye
 

Il giorno lunedì 16 luglio 2012 23:25:48 UTC+2, DanR ha scritto:

> This may not be a render server problem, but perhaps someone else has 
> experienced it and can figure out what I'm doing incorrectly. 
>
> I have two MediaWikis running on the same server.  Until recently, they 
> were both running Mediawiki 1.16.0, along with the Collection extension 
> version 1.4.  They both had exactly the same render server settings in 
> LocalSettings.php, including the same $wgCollectionMWServeURL.  These 
> wiki's are internal to our firewall, so we have our own version of the 
> render server running.  Everything worked properly.
>
> We made the decision to update both MediaWiki's to MW version 1.19.1.  I 
> upgraded the first one, and in the process, also upgraded the Collection 
> extension to 1.5.   Now, whenever I attempt to generate a PDF, I get the 
> following message on the 1.19.1 MW.  I've replaced the real server name 
> with "servername" *"The POST request to http://mwrender.servername:8899/** 
> failed 
> ($2)."*  Because of this problem, I have not updated the other MW on the 
> same server, and it still works properly.  I can't tell if this is a 
> problem with the collections extension, or with the new version of MW, or 
> both.  I tried updating the MW 1.16 collection extension to 1.5, but I get 
> a message that there are unsupported operand types in Collection.php.  I 
> tried downgrading the MW 1.19 collection extension back to Collection 
> version 1.4, but then, when I try to generate a PDF, I get an error that 
> says " Hook CollectionHooks::buildNavUrls failed to return a value. 
>
> I can't find anything that I need to be doing differently in the 
> LocalSettings.php file with MW 1.19 and collection 1.5.  
>
> I'd appreciate any advice that someone could give if they've experienced a 
> similar problem, or if someone can provide some suggestions that I can use 
> to gather more information about the root of the problem.
>
> It it's relevant, the server is running RedHat Enterprise Release 4 and 
> the kernel is 2.6.9-89.0.16.ELxenU GNU/Linux.
>
> Thanks in advance,
> Dan
>
>

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