[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [Z] edu domain EDUCAUSE administrator address mail exchangers 2nd MX records routing loops encryption enumeration of objects errors [See also troubleshooting] messages nonexistent domain (nslookup) rcodes for SERVFAIL Event Log Event Viewer DNS console example programs, obtaining 2nd existing domains expire value expiring cached data changing TTL extensions extranets |