- Domain names must have at least one "dot" or period. This is an
internet standard published in RFC
2109.
- Domain names cannot contain underscore ( _ ) characters. This was not
a problem with earlier versions of Internet Explorer or Netscape browsers.
However, Internet Explorer browser versions 5.5 and 6.0 do not accept
underscores in the cookie. This is an internet standard. See RFC 1123 and RFC 932.
- Do not use the server name (such as
machinename.ibm.com or
hostname.ibm.com) in the domain name.
Examples of valid domain names are ibm.com, tx.gov, austin.ibm.com.
Examples of invalid domain names are ibmus, state_tx.gov
Some customers have experienced problems with Internet Explorer,
versions 5 and 6, which do not seem to accept the Lightweight Third-Party
Authentication (LTPA) token when the domain defined in the Single Sign On
(SSO) domain field is less than 5 characters, excluding the period, such
as "cn.ca".
Please refer to the Microsoft® knowledge base article: "Internet
Explorer Does Not Set a Cookie for Two-Letter Domains."
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