Total password lockout

Total password lockout

I am dealing with an issue right now with a dedicated server locking me
out of WHM, cPanel, and receiving emails from all websites on this server.
I type my username/password and it tells me the 'login is invalid'. I
submitted a ticket and have been working on this issue for the last 4
hours with no success. The tech I have been working with can't seem to pin
point the issue. I am wondering if anyone here has even experienced
something like this.
It started with a simple question about email settings on a new dedicated
server. After checking things out whether I should use POP or IMAP. The
tech finally told me to use POP. I went to login with my usual credentials
into WHM and I get an invalid login. I soon find out that my emails and
cPanel are all doing the same thing, they will not accept my username
password combo even though I have checked/changed done everything to make
sure they are correct. We ran a traceroute and everything seems fine
there.
Any ideas what might be going on? The server is running CentOS 6.4
I should also mention that the tech is able to login just fine on his end.