I am having an issue connecting to external FTP sites that require a username and password through TMG 2010. I am able to connect to any anonymous FTP site, and I can connect to the authenticating FTP servers, but it just keeps prompting for credentials over and over even though the password is correct. . This was working fine until Century Link changed out our DSL modem and it has not worked since. You would think, of course it's the DSL modem, but when I connect directly to the back of the modem and bypass the TMG server, I can authenticate and login to any FTP server that I want. This TMG server is running SP2 hotfix 4 and I have the FTP policy created, I have made sure that none of the policies have the read only flag checked on the FTP configuration for each policy (even the non ftp), I have active FTP enabled, but still cannot authenticate. The firewall logs show the traffic as "allowed" when I run a test but if I try to access the FTP site through Windows Explorer from the TMG server, it tells me that read only mode is active. All workstations behind the TMG server exhibit the same behavior. I have also tried using the firewall client but get the same results with that, and Filezilla also says the user name and pw are incorrect even though they are not.. I have tried just about every fix that I can find but I can't seem to find any articles describing this exact issue. Any help is greatly appreciated.