URL: https://github.com/SSSD/sssd/pull/193 Title: #193: UTIL: Use max 15 characters for AD host UPN
sumit-bose commented: """ MSFT speaks about the size of NetBIOS names (16 characters, so 15 character plus the '$') e.g. in https://support.microsoft.com/en-us/help/163409/netbios-suffixes-16th-character-of-the-netbios-name. But since NetBIOS predates the usage by Microsoft there is also https://www.ietf.org/rfc/rfc1001.txt section 14. There is a 20 character limit on sAMCcountName and the attribute is used in AD to store the NetBIOS name of a host as well because from the AD perspective hosts and users share various properties. But although user names can be up to 20 characters the NetBIOS names are limited to 16 (15 + $) because of the restrictions of the NetBIOS protocol. """ See the full comment at https://github.com/SSSD/sssd/pull/193#issuecomment-290508874
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