In our environment we have Remote Desktop Services Host running patched and up to date Windows 2008 R2 Enterprise behind Remote Desktop Gateway running Windows 2012 R2 Standard. Dual Factor Authentication from Windows Azure is used in our system as well.<o:p></o:p>
We experienced following strange behavior. Users with updated Windows 7 clients can successfully authenticate against RD Gateway, receive a call from Windows Azure DFA, authenticate and establish remote session to RDSH. No issues while working in remote session until user need step back or minimize the active RD session window. After 120 seconds the session get dropped and reconnects immediately and the user receives another authentication call from DFA.<o:p></o:p>
No errors on client side, no errors on DFA, RDG or RDSH servers, just entries that the session was disconnected and then reconnected.<o:p></o:p>
Running Wireshark on the clients side shows that the local computer sends RST, ACK which drops connection and then immediately sends SYN to RDG server with initiates connection reestablishment and a call from DFA. <o:p></o:p>
We figured out that this behavior is related to the stations with KB2923545 installed. As soon as we remove mentioned KB, no session drops.<o:p></o:p>
Anybody experiencing the same and had found other solution then just removing windows update KB2923545? <o:p></o:p>