Hello, I had a problem and after some research I discovered the exactly point where is failing.

blog.domain.com

Is not working, it says that the page cannot be found (404)

blog.domain.com/index.php

Working as expected

If you click on Home, it will says that the page cannot be found, if you try to preview a new post, it says that the page cannot be found... I can see every post btw.

I run my blog on a Windows hosting using IIS.

my permalink is this:

/index.php/%postname%

IIRC I had to use index.php because my IIS doesn't have URL rewriting.

I have no problem with the index.php thing on the url, I have now a good SEO and I don't want to change my permalink but I Don't know why is not working now... just from one day to the next...

It's a problem of WP or is just my host messing up? If is my blog, do you know what is causing this? (Just for create a concrete ticket about the exactly problem)

Thank you.