Yahoo Picking Up PHP Session IDs

[onlineshrine]

For one of my sites, Yahoo seemed to pick up a PHP session ID in the URL even though my site doesn't pass session IDs in the URL. My programmers are stumped. The consequence of this was dropping from #2 in an important keyword to #47, and Yahoo not recognizing that it is the same URL for which I have paid for a Yahoo directory listing (which seems to bump me up in ranking over normal Inktomi results as found on hotbot).

Is anyone else having a similar experience with Yahoo's bot?

[2_much]

I haven't seen this at all, must be a glitch on their part. Has this been fixed?

[Tenyque]

I've also seen session id URLs attributed to a client, when I use the site search in Yahoo!. I've never known the client to use session IDs in the URL, and the server doesn't currently add it for any cookie on/off, javascript on/off browsing privacy setting variation.
I'm tentatively assuming it is a combination of a stale section of index and that the client is currently serving requests for the session id URLs with a 302 redirect to the homepage. Hoping that a change to 301 and just plain waiting will help get the session id URLs lumped in.

[badtzmaru]

Yes, use a 301 for those session ID redirects. As far as I can tell, a 301 will associate the end content with the end URL whereas a 302 will associate the end content with the first url.

[2_much]

I think at the moment they have a problem with 301 and 302 redirects so I'd be wary of using them.