Can't figure out what's going on with these strange 403's

[NoahsDad]

The last crawl found a good number of 404's and I can't figure out what's going on.  I don't even recognize these links.  What's really strange is a few of them high a fairly decent page authority. For instance this one has a PA of 55:

http://noahsdad.com/?path=http%3A%2F%2Feurosystems.it%2Fconf_commerciale%2Fimages%2Fdd.gif%3F%3F

There are several more like this one also, it seems most of these new ones have "Feurosystems" in the link...I have no idea what that is.

Just curious what you guys think is going on, why these are 404'ing, and how to fix it.

Thanks.

Edit: I took out the "%" from the links and I get this: http://noahsdad.com/?path=http3A2F2Feurosystems.it2Fconf_commerciale2Fimages2Fdd.gif3F3F

which takes me to a page on my site. I have no idea what's going on, or what that link is. Hoping someone can chime in because this is strange.

Another edit: I just checked out the Google Webmaster's and it looks like these errors are 403's and all started around March 21st. I have no idea what happend on March 21st to start causing all of these errors, but I'd sure like to get it fixed.

[EGOL]

I see a lot of URLs with garbage characters in my link reports.

My guess is that these are links generated by spammer programs that contain errors.

Anybody agree with that?

[NoahsDad]

What's interesting about this is that if you take out the %, the url exists. That URL is actually on my site. I have no idea how it got there though. Very strange.

[EGOL]

I see.

Everything after the ? is a parameter.

You can use rel=canonical to pass the credit for these links to the base url on your website.  Or, you can add code to your .htaccess to 301 these URLs to a genuine address on your website.

[NoahsDad]

But the question I really have is WHERE did these pages come from? Also the original page has a canonical tag on it. I just don't know how this page was created, and why it has such a high rank since it's a very new page. It's very strange.

[AlanMosley]

If you look at the souce code of your home page you sill see that you have links to these urls.

These pages dont return a 404, they return a 403 to be, forbidden.