Pidgin Yahoo! login fix (25-06-09)

There had been some issues on the login for the yahoo messenger on pidgin. The authentication issues were caused by Yahoo!'s changes to their servers:

 

From: theflamingbanker.blogspot.com/2009/06/some-clarification-on-yahoo-issues.html

 

The specific problem that affected us is the authentication mechanism. Yahoo Messenger 6 used a spectacularly complicated password obfuscation method to "encrypt" the password as it was being sent over the wire to Yahoo's servers. Back in 2004 when we were preparing our 0.79 release, Cerulean Studios, the creators of the Trillian client, were kind enough to implement this authentication mechanism for us. As part of this change, we began to identify to the Yahoo servers as Yahoo Messenger 6. This was all fine and well.

The real problem came relatively recently. At some point in our recent history, which I honestly don't feel like tracking down now, we started identifying as Yahoo Messenger 7. At some point after that we again updated to identify as Yahoo Messenger 8. Both of these changes were related to file transfer and other feature enhancements. When we made these changes, however, we never updated our authentication code. This means we were claiming to speak Yahoo Protocol version 15 but we authenticated the same way protocol version 13 clients do. Even this worked for quite some time.

Yahoo began upgrading their servers at some point recently to phase out the old Yahoo Messenger 6 client. In effect, they want to force users of older software to update to the current client. Whether this is a good thing or not depends on your perspective. From Yahoo's point of view, I'm sure this is an excellent move, as it should make their server software simpler (speak one less protocol, one less auth scheme, etc.) and reduce their support load (fewer client versions to deal with). Where it became a problem for us is that at the same time, they started requiring protocol version 15 clients to speak the version 15 authentication scheme, which we never implemented. Since we still spoke version 13's authentication, this cut us off entirely.

[Note: Some users have discovered that not all of the Yahoo Messenger servers are rejecting the old authentication mechanism from Pidgin. The number of servers that still accept it appears to be shrinking, however. We advise upgrading to Pidgin 2.5.7 as soon as possible.]

 

The fix that worked is to change the server field in the advanced tab to scsa.msg.yahoo.com


Links:

www.celticwolf.com/useful-information/faqs/26-pidgin-yahoo


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