I have inherited an ACS 3.2 system running on windows 2000. When i try to add a new switch using the same settings as previously working switches i get a "Key mismatch " in the failed attempts log. I have double checked that the keys are the same on the switch and in ACS. I have tried different keys as well eg 123456. I have also check that a NDG key does not exist. Where should i go from here to troubleshoot this issue?