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Get base DN of IPA suffix in given LDAP server.
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Given a domain search it for SRV records, breaking it down to search
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:param tried: A set of domains that were tried already
:param reason: Reason this domain is searched (included in the log)
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Use DNS discovery to identify valid IPA servers.
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instead of discovering available LDAP SRV records.
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Given a host and kerberos realm verify that it is an IPA LDAP
server hosting the realm.
Returns a list [errno, host, realm] or an empty list on error.
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0 means all ok
negative number means something went wrong
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:param default_port: When default_port is not None, it is being
checked with the port in SRV record and if they don't
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