Process MAD.EXE (PID=1932). All Domain Controller Servers in use are not responding:

Process MAD.EXE (PID=1932). Topology discovery failed, error 0x80040a02 (DSC_E_NO_SUITABLE_CDC). Look up the Lightweight Directory Access Protocol (LDAP) error code specified in the event description. To do this, use Microsoft Knowledge Base article 218185, "Microsoft LDAP Error Codes." Use the information in that article to learn more about the cause and resolution to this error. Use the Ping or PathPing command-line tools to test network connectivity to local domain controllers.

Process MAD.EXE (PID=1932). All Domain Controller Servers in use are not responding: 
DC02.targetiletisim.local 
DC01.targetiletisim.local 

Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=1148). Topology discovery failed, error 0x80040a02 (DSC_E_NO_SUITABLE_CDC). Look up the Lightweight Directory Access Protocol (LDAP) error code specified in the event description. To do this, use Microsoft Knowledge Base article 218185, "Microsoft LDAP Error Codes." Use the information in that article to learn more about the cause and resolution to this error. Use the Ping or PathPing command-line tools to test network connectivity to local domain controllers.

pls help me :(