Access for /logs requires a username

HI All

I just loaded up two new sites and must have made an error somewhere. As soon as I login in I am asked:

“The server mysite.com:80 at Access for /logs requires a username and password”

I have not set anything up in either site.

I can click cancel to bypass it but each thing I try and do in the site it pops up.

Any thoughts?

Thanks

Graeme