I am new to both Shareplus and F5. We have successfully configured our F5 as a reverse proxy and can log into our sharepoint system from an external address. However when we use the Shareplus app we get the "The data couldn't be read because it isn't in the correct format" error. I am guessing it is around authentication and SSO. The page for the F5 is a web page login with username and password. If I look at the log on the F5 the sessions that error out doesn't have username associated and seems to stop right before the SSO piece. 

Has anyone gotten a F5 to work with Shareplus that could share some tips?