Why are you getting rejected shares?
There are four different types of rejects:
- Share above target: There could be a problem with the mining software that needs to be inspected.
- Stale share: The share was submitted too late (probably because of the high ping or problems with connection).
- Duplicated share: The share was submitted more than once.
You can find the type of rejected share by checking your mining stats, when you inspect the detailed mining stats for individual algorithm.