thanks for your reply, yes the distributed cache was stopped so i start it. but now i get a new correlation ids problem "77f6bb9c-0c6a-c0b7-30fc-0c22f8a73581", can you check my edit to the original question . kindly note that this problem only happens if i try to add/edit a wiki page and i update the wiki page name .can you adivce pelase?