thanks in attach is clients log file
Well... user tried to authorize software with wrong email or password, then got IP block after too many attempts.
2020-05-11 13:16:54: 13604: : User authentication procedure
2020-05-11 13:16:56: 13604: : Invalid E-mail/password combination.
2020-05-11 13:17:04: 13604: : Authentication attempt
2020-05-11 13:17:04: 13604: : User authentication procedure
2020-05-11 13:17:04: 13604: Error : FAIL:IP is blocked (IsUserExists)|| Exception: IP is blocked|| StackTrace: at SupportLib.WebServiceFunctions. .MoveNext() | --- End of stack trace from previous location where exception was thrown --- | at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() | at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) | at SupportLib.WebServiceFunctions..MoveNext()
2020-05-11 13:17:04: 13604: : Too many login attempts
IP is unlocked within an hour. Email and pass should be inserted correctly., there is some mistake with it on user side.