This is caused by another program listening to TCP port 443 where the Blackbaud Web Services service is running.

To discover what application is utilizing the port do the following:
  • If User Account Control (UAC) is enabled, Click Start > All Programs > Accessories and right-click on "Command Prompt" and select "Run as Administrator" OR in the Search box, type CMD and when cmd.exe appears in your results, right-click on cmd.exe and select "Run as administrator". 
  • If User Account Control (UAC) is disabled, Click Start > All Programs > Accessories and double-click on "Command Prompt" OR in the Search box, type CMD and when cmd.exe appears in your results, double-click on cmd.exe.
  1. Type netstat -ano | more and hit enter.  Look for Port 443 to see what Process ID is using this port that RE:Event needs.  Write down the PID number that is associated with TCP Port 443.
  2. Click Start and Type Task Manager and hit enter.
  3. Click on the Processes tab.
  4. Click View > Select Columns and add the PID (Process Identifier column).
  5. Scrolling down until you match the process that has the Process ID (PID) you recorded in step 3.
  6. This process will need to be removed from the machine in order for Mobile Event Manager to work on this machine, or you can move the Blackbaud Web Services to another workstation/server.