There are known issues with WCCP and Hotmail/Yahoo. I do not know where this was fixed (somewhere after 12.2.7a) but the 12.2.12a IOS version works ok. Make sure to check the IOS for bugs before you load it up on your router.
Dig deeper on Network Administration
Related Q&A from Retired Expert - Mark _Dargin1
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.