Event Viewer Error Messages

I received 3 error messages on my RAS machine in the event viewer. The source for all three is MSExchangeWEB. The first message is “Read client returned failure. Last error is 10060.” The second one is “End of data reached while looking for token————–7d17854f4.” And the third one is the same as the second except the number is 7d137a243e8.” Any suggestions?