Event ID - 30

Event Id30
SourceJET
DescriptionUnable to create log. The drive may be read-only or out of disk space. Error - 1032
Event InformationThe DHCP service stops responding to client lease and renewal requests and this event will be logged along with DHCP server events 1014 and 1016 in to the System and Application logs.
Cause:
The DHCP service uses a JET database to store configuration and lease information. The service creates a backup copy of its database at a regular interval. Any program or service other than the DHCP service gaining access to the files in the DHCP directory may cause a sharing violation. As a result of the sharing violation, the DHCP service stops processing all client requests because it requires exclusive access to its database and log files. Resolution: 
Windows NT Server or Workstation 4.0 To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update.
Reference LinksDHCP Server Stops Leasing Addresses if a Sharing Violation Occurs

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