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My mount works with AUTH_SYS, but fails when using Kerberos 5 (-osec=krb5)?

April 26, 2017fails Kerberos Mount

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My mount works with AUTH_SYS, but fails when using Kerberos 5 (-osec=krb5)?

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There are many reasons this could be failing. First verify that rpc.gssd is running on the client and rpc.svcgssd is running on the server. Running these daemons with option “-vvv” will produce extra debugging output which may give more information about the problem. What to look at next depends on the messages that you see… • Verify that your hostnames are correct. The hostname command should return a fully-qualified hostname that has a correct DNS reverse-mapping (either through DNS or the /etc/hosts file). • Verify there is a keytab entry for nfs/@REALM in your keytab file (/etc/krb5.keytab). • Verify your Kerberos configuration file has the proper mapping from the DNS hostname to the correct realm. The [domain_realm] stanza of the /etc/krb5.conf needs to have a mapping from the DNS domain to the correct REALM.