EDNS0 allows larger User Datagram Protocol (UDP) packet sizes. However, some firewall programs may not allow UDP packets that are larger than 512 bytes. Therefore, these DNS packets may be blocked by the firewall.
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- At a command prompt, type the following command, and then press Enter: dnscmd /config /enableednsprobes 0Note Type a 0 (zero) and not the letter "O" after "enableednsprobes" in this command.
The following information appears:
Registry property enableednsprobes successfully reset.
Command completed successfully.
<Root>: type OPT, class unknown
Type: EDNS0 option
UDP payload size: 1280