Jim,
I was using weblink validator relsoftware.com/wlv/downloads/ to find errors on my site and came up with this:
" Broken links sorted by page
Page #1:mysite.com/xmlrpc.php?rsd
1. Link: mysite.com/wp-app.php/service
Error: 500 Internal Server Error
Comment: Line: 11 "
when I go to mysite.com/xmlrpc.php?rsd
I get a web page that looks like this:
" This XML file does not appear to have any style information associated with it. The document tree is shown below.
−
<rsd version="1.0">
−
<service>
<engineName>WordPress</engineName>
<engineLink>wordpress.org/</engineLink>
<homePageLink>mysite.com</homePageLink>
−
<apis>
<api name="WordPress" blogID="1" preferred="true" apiLink="mysite.com/xmlrpc.php"/>
<api name="Movable Type" blogID="1" preferred="false" apiLink="mysite.com/xmlrpc.php"/>
<api name="MetaWeblog" blogID="1" preferred="false" apiLink="mysite.com/xmlrpc.php"/>
<api name="Blogger" blogID="1" preferred="false" apiLink="mysite.com/xmlrpc.php"/>
<api name="Atom" blogID="" preferred="false" apiLink="mysite.com/wp-app.php/service"/>
</apis>
</service>
</rsd> "
When I go to
mysite.com/wp-app.php/service
I get a webpage that says
"401 Unauthorized
Credentials required."
What’s wrong, why all these errors?
Thanks,
Roger

Jim,
my webhost wrote back on this question
"It looks like that page requires authentication, so a script that checks links would definitely return an error. I don’t see anything awry with it."
So I guess the fault is the lack of a password when the weblink validator was trying to work on the pages.
Roger
Jim,
Is that right mysite.com/wp-app.php/service is a page that requires authentication (my password?). shouldn’t there be a forward slach after "service"?
Thanks,
Roger
Jim,
I guess no forward slash is used, I put one in and got a blacnk page where without it I gor a 401 error saying authentication is required.
Roger
In IE, you’ll get a 404 for /service/
and a 500 for /service
I’m not sure what’s going on there?
Jim,
I think the xmlrpc.php is for the pingback function cited in the <head>
quietearth.us/articles/2006/10/30/Coding-your-own-blog-Pingback-in-php
Roger