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This meant basic tasks such as translating a UNIX UID to a user name string could stall because NetInfo was stuck on a DNS lookup. At first, it was possible to disable NetInfo and use the Unix system files, but starting in NeXTSTEP version 2, this disabled DNS support. Thus, NeXT computers became notorious for locking a user out of everyday ...
Alternatively, you need to disable caching of proxy auto-configuration results by editing the registry. [ 7 ] It is recommended to always use IP addresses instead of host domain names in the isInNet function for compatibility with other Windows components which make use of the Internet Explorer PAC configuration, such as .NET 2.0 Framework .
DHCP has a higher priority than DNS: if DHCP provides the WPAD URL, no DNS lookup is performed. This only works with DHCPv4. In DHCPv6, there is no WPAD-Option defined. When constructing the query packet, DNS lookup removes the first part of the domain name (the client host name) and replaces it with wpad. Then, it "moves up" in the hierarchy ...
Using a firewall to disable DNS on whole device (usually outgoing connections UDP and less commonly TCP port 53), or setting DNS servers to non-existing ones like local 127.0.0.1 or 0.0.0.0 (via command line or 3rd party app if not possible via OS GUI interface). This requires alternate ways of resolving domains like the above-mentioned ones ...
Domain Name System blocking, or DNS blocking / filtering, is a strategy for making it difficult for users to locate specific domains or websites on the Internet. It was first introduced in 1997 as a means to block spam email from known malicious IP addresses .
Most email software and applications have an account settings menu where you'll need to update the IMAP or POP3 settings. When entering your account info, make sure you use your full email address, including @aol.com, and that the SSL encryption is enabled for incoming and outgoing mail.
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For example, to do a reverse lookup of the IP address 8.8.4.4 the PTR record for the domain name 4.4.8.8.in-addr.arpa would be looked up, and found to point to dns.google. If the A record for dns.google in turn pointed back to 8.8.4.4 then it would be said to be forward-confirmed.