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HSTS addresses this problem [2]: §2.4 by informing the browser that connections to the site should always use TLS/SSL. The HSTS header can be stripped by the attacker if this is the user's first visit. Google Chrome, Mozilla Firefox, Internet Explorer, and Microsoft Edge attempt to limit this problem by including a "pre-loaded" list of HSTS sites.
A value of 3 is for what is commonly called domain issued certificate (and DANE-EE). The TLSA record matches the used certificate itself. The used certificate does not need to be signed by other parties. This is useful for self-signed certificates, but also for cases where the validator does not have a list of trusted root certificates.
This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for bidirectional traffic. TCP usually uses port numbers that match the services of the corresponding UDP implementations, if they exist, and vice versa.
Moreover, SSL 2.0 assumed a single service and a fixed domain certificate, conflicting with the widely used feature of virtual hosting in Web servers, so most websites were effectively impaired from using SSL. These flaws necessitated the complete redesign of the protocol to SSL version 3.0.
To resolve this, move some of the email to a new folder in your account. Use this info to configure your app. Incoming Mail (IMAP) Server • Server - export.imap.aol.com • Port - 993 • Requires SSL - Yes. Outgoing Mail (SMTP) Server • Server - smtp.aol.com • Port - 465 • Requires SSL - Yes • Requires authentication - Yes. Your ...
Next, it may be that there is not a domain name named "www.example.com", in which case instead of returning a RRSIG record in the answer, there will be either an NSEC record or an NSEC3 record. These are "next secure" records that allow the resolver to prove that a domain name does not exist.
SSL (Secure Sockets Layer) is an industry standard for encrypting private data sent over the Internet. It helps protect your account from hackers and insures the security of private data sent over the Internet, like credit cards and passwords.
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.