I have noticed that happen a couple times in the last few days.  FreeIPA
server 4.1.3 on CentOS 7 with a sync relationship to a Windows server
2008R2 domain controller.

The web ui will stop working and just show a blank page.

When I try to do a ipactl status the command just freezes and does nothing.

In the exmaple I paste below, there was 5 minutes between when I entered
the command and when I did ctrl-c after getting tired of waiting for
nothing to happen.
After the ipactl command failed to work at all, I decided to restart the
httpd service manually, and then saw a whole pile of strange errors around
failing to bind to ldap server and generic kerberos errors.

Rebooting the server seems to work for 24 hours or so until things go
wonky again.

[username@dc1 ~]$ sudo su -
Last login: Fri Jun  5 16:05:55 UTC 2015 on pts/0
[root@dc1 ~]# ipactl status
^CCancelled.
[root@dc1 ~]# ipactl restart
^CCancelled.
[root@dc1 ~]# ipactl restart
^CCancelled.
[root@dc1 ~]# systemctl restart httpd
[root@dc1 ~]#


Jun 05 21:02:32 dc1.mydomain.net systemd[1]: Stopping The Apache HTTP
Server...
Jun 05 21:03:01 dc1.mydomain.net winbindd[2171]: GSSAPI client step 1
Jun 05 21:03:01 dc1.mydomain.net winbindd[2171]: GSSAPI client step 1
Jun 05 21:03:19 dc1.mydomain.net systemd[1]: Created slice user-0.slice.
Jun 05 21:03:19 dc1.mydomain.net systemd[1]: Starting Session 161 of user
root.
Jun 05 21:03:19 dc1.mydomain.net systemd-logind[604]: New session 161 of
user root.
Jun 05 21:03:19 dc1.mydomain.net systemd[1]: Started Session 161 of user
root.
Jun 05 21:03:19 dc1.mydomain.net login[614]: pam_unix(login:session):
session opened for user root by LOGIN(uid=0)
Jun 05 21:03:19 dc1.mydomain.net login[614]: ROOT LOGIN ON tty1
Jun 05 21:03:22 dc1.mydomain.net winbindd[2171]: [2015/06/05
21:03:22.932855,  0] ipa_sam.c:4144(bind_callback_cleanup)
Jun 05 21:03:22 dc1.mydomain.net winbindd[2171]: kerberos error:
code=-1765328324, message=Generic error (see e-text)
Jun 05 21:03:22 dc1.mydomain.net winbindd[2171]: GSSAPI client step 1
Jun 05 21:03:22 dc1.mydomain.net winbindd[2171]: GSSAPI client step 1
Jun 05 21:03:43 dc1.mydomain.net winbindd[2171]: [2015/06/05
21:03:43.935800,  0] ipa_sam.c:4144(bind_callback_cleanup)
Jun 05 21:03:43 dc1.mydomain.net winbindd[2171]: kerberos error:
code=-1765328324, message=Generic error (see e-text)
Jun 05 21:03:46 dc1.mydomain.net smbd[2208]: GSSAPI client step 1
Jun 05 21:03:46 dc1.mydomain.net smbd[2208]: GSSAPI client step 1
Jun 05 21:04:02 dc1.mydomain.net systemd[1]: httpd.service stopping timed
out. Killing.
Jun 05 21:04:02 dc1.mydomain.net systemd[1]: httpd.service: main process
exited, code=killed, status=9/KILL
Jun 05 21:04:02 dc1.mydomain.net systemd[1]: Unit httpd.service entered
failed state.
Jun 05 21:04:02 dc1.mydomain.net systemd[1]: Starting The Apache HTTP
Server...
Jun 05 21:04:02 dc1.mydomain.net systemd[1]: Started The Apache HTTP Server.
Jun 05 21:04:07 dc1.mydomain.net smbd[2208]: [2015/06/05 21:04:07.152666, 
0] ipa_sam.c:4144(bind_callback_cleanup)
Jun 05 21:04:07 dc1.mydomain.net smbd[2208]: kerberos error:
code=-1765328324, message=Generic error (see e-text)
Jun 05 21:04:07 dc1.mydomain.net smbd[2208]: [2015/06/05 21:04:07.152995, 
0] ../source3/lib/smbldap.c:998(smbldap_connect_system)
Jun 05 21:04:07 dc1.mydomain.net smbd[2208]: failed to bind to server
ldapi://%2fvar%2frun%2fslapd-MYDOMAIN-NET.socket with dn="[Anonymous
bind]" Error: Local error
Jun 05 21:04:07 dc1.mydomain.net smbd[2208]: (unknown)
Jun 05 21:04:07 dc1.mydomain.net smbd[2208]: [2015/06/05 21:04:07.153407, 
0]
../source3/rpc_server/netlogon/srv_netlog_nt.c:975(_netr_ServerAuthenticate3)
Jun 05 21:04:07 dc1.mydomain.net smbd[2208]: _netr_ServerAuthenticate3:
failed to get machine password for account office.mydomain.net.:
NT_STATUS_NONE_MAPPED
Jun 05 21:08:02 dc1.mydomain.net winbindd[2171]: GSSAPI client step 1
Jun 05 21:08:02 dc1.mydomain.net winbindd[2171]: GSSAPI client step 1
Jun 05 21:08:23 dc1.mydomain.net winbindd[2171]: [2015/06/05
21:08:23.034001,  0] ipa_sam.c:4144(bind_callback_cleanup)
Jun 05 21:08:23 dc1.mydomain.net winbindd[2171]: kerberos error:
code=-1765328324, message=Generic error (see e-text)
Jun 05 21:08:23 dc1.mydomain.net winbindd[2171]: GSSAPI client step 1
Jun 05 21:08:23 dc1.mydomain.net winbindd[2171]: GSSAPI client step 1

I also got this error from the web ui after restarting httpd:

Runtime error

Web UI got in unrecoverable state during "metadata" phase


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