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IPA server of version 2.2 and higher supports Kerberos S4U2Proxy delegation, i.e. ipa command no longer forwards Kerberos TGT to the server during authentication. However, when IPA client of version 2.2 and higher tries to join an older IPA server, the installer crashes because the pre-2.2 server expects the TGT to be forwarded. This patch adds a fallback to ipa-client-install which would detect this situation and tries connecting with TGT forwarding enabled again. User is informed about this incompatibility. Missing realm was also added to keytab kinit as it was reported to fix occasional install issues. https://fedorahosted.org/freeipa/ticket/2697