Debugging operations on individual client sessions for a remotely executed shared application are enabled to be performed as the client requests are processed on the executing server without disrupting execution of other client sessions. A remote debugging client may connect to a debugging engine executed on the server allowing the debugging client to view source code, set breakpoints, view client connections, and receive callbacks or notifications when a breakpoint is hit by the client session being debugged. The debugging client may also control execution by stepping through client code enabling debugging of multiple clients simultaneously.