We are running RemoteApp on a Windows 2008 R2 server. We are publishing 3 apps, one of which is Excel. We have 5 office worldwide. One of our USA offices is having problems connecting to the Published Apps. We are able to logon to RemoteApp with no problem. When we launch any of the Published Applications, we are prompted for user credentials. When we enter the credentials, we are receiving an error, "The logon attempt failed." The clients are all running Windows 7 and IE11. Something seems to have changed for this site, because we were able to launch Published Apps from this network previously. Published Apps are working for all other locations.