Two frustrations when you do the upgrade. One is FTP does not seem to work and the second is some SSL sites do not work well. Kevin mentioned the ftp solution. Open ISA management and click on the firewall policy. Look for the SBSInternet Access Rule. Right click and configure FTP. Clear the read only box. Click on Apply.
Second annoyance is SSL sites may not work so swell. Configuration and then General. Look for Define Connection Limits on the right. One of those boxes is set to 40. Change it to 160, Apply, OK, and Apply at the top.
You probably need to get the workstation to update their firewall client. Right click and on the workstations firewall client. I just do the click that lets you check the server name. You can waste a lot of time if you do not update the firewall client.