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tutorial:adm:sso_ad_domain [2020/02/11 07:23]
doischert 		tutorial:adm:sso_ad_domain [2020/06/12 16:27]
apeterova
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   * The keytab shouldn't be generated with only some ciphers, so use ''-crypto all'' in the command as above.   * The keytab shouldn't be generated with only some ciphers, so use ''-crypto all'' in the command as above.
  
-Usual messages in Apache error log:+Usual messages in Apache error logs:
   * ''krb5\_get\_init\_creds\_password() failed: Cannot contact any KDC for requested realm'': make sure that DC in /etc/krb5.conf kdc communicates on port 88:   * ''krb5\_get\_init\_creds\_password() failed: Cannot contact any KDC for requested realm'': make sure that DC in /etc/krb5.conf kdc communicates on port 88:
 <code bash> <code bash>
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   * ''krb5\_get\_init\_creds\_password() failed: Preauthentication failed'': the given user has different password.   * ''krb5\_get\_init\_creds\_password() failed: Preauthentication failed'': the given user has different password.
   * ''gss\_accept\_sec\_context() failed: No credentials were supplied, or the credentials were unavailable or inaccessible (, Unknown error)'': the client doesn't trust the address of IdM, i.e. it isn't in Trusted sites in Internet Explorer.   * ''gss\_accept\_sec\_context() failed: No credentials were supplied, or the credentials were unavailable or inaccessible (, Unknown error)'': the client doesn't trust the address of IdM, i.e. it isn't in Trusted sites in Internet Explorer.
 +  * ''gss\_accept\_sec\_context() failed: An unsupported mechanism was requested (, Unknown error)'': the client doesn't trust the address of IdM, i.e. it isn't in Trusted sites in Internet Explorer. (probably)
 +  * ''request failed: error reading the headers'' (and HTTP response 400): This happens to users who are members of many AD groups (e.g. more than 100) and use IE. More precisely: the Authorization header (holding Kerberos ticket) is longer than the max size of HTTP headers in the Apache webserver. Some browsers, e.g. Chrome, cuts off the tickets, but IE doesn't. You may increase the limit of the header size in Apache HTTP Server by the [[https://httpd.apache.org/docs/2.2/mod/core.html#limitrequestfieldsize|LimitRequestFieldSize]] directive. However, the limit may be also on the application server (Apache Tomcat, JBoss). Then you can unset the header so it's not proxied to the application server - put ''RequestHeader unset Authorization'' in the ''/etc/httpd/conf.d/ssl.conf''.
   * ''failed to verify krb5 credentials: Key table entry not found'': something is wrong with the keytab. Try to compare its version (KVNO) and the version of Kerberos ticket:   * ''failed to verify krb5 credentials: Key table entry not found'': something is wrong with the keytab. Try to compare its version (KVNO) and the version of Kerberos ticket:
 <code> <code>
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 ===== See also ===== ===== See also =====
-[[9.7:adm:tips_for_configuring_sso_on_windows|Tips for configuring SSO on Windows (can be useful on Linux servers as well)]]+[[tutorial:adm:sso_configuring_tips|Tips for configuring SSO on Windows (can be useful on Linux servers as well)]]
  • by apeterova