Hello, comments inline

Martin

On 27/04/15 18:09, Christopher Lamb wrote:
Hi All

I may have found a possible cause of our instance of the  "Your session has
expired" Web UI error on our new FreeIPA 4.1.0 Server

By chance I checked the date on the server hosting FreeIPA 4.1.0. To my
surprise, despite running ntpd it was 2 hours in the future!
Yes, time is important for successful kerberos login.

Some moons ago we suffering from clock-skew problems, and had spent a lot
of time understanding ntp, and setting up an optimal ntp
architecture /config. We were able to completely eliminate clock-skew
across all our servers.

Digging into the /etc/ntp.conf file I saw that FreeIPA had replaced our 4
NTPD servers with 4 RedHat NTPD servers.
We plan fix this in new version

Therefore I returned the /etc/ntp.conf file to our default, restarted ntpd,
and time was correct again.

Subsequent to this (at least at various points today) I have been able to
successfully log into the Web UI from Firefox and Safari on OSX, and
Firefox on Windows. On both platforms Chrome (not supported) does not work.

I confess I have not had the time to return to the FreeIPA ntp config to
see if the 2 hour offset + Web UI session problem can be reproduced, so at
the moment this remains a credible, but not proven hypothesis.

However I guess that  2 hour offset probably comes from the 2 hour
difference between UTC and European Summertime.

I think it would be great if the changes made by FreeIPA setup to ntp.conf
were optional - we care strongly about the content of that file!

ipa-server-install

-N, --no-ntp        do not configure ntp

Cheers

Chris


----- Forwarded by Christopher Lamb/Switzerland/IBM on 27.04.2015 15:36
-----

From:   Christopher Lamb/Switzerland/IBM@IBMCH
To:     freeipa-users@redhat.com
Date:   26.04.2015 01:29
Subject:        [Freeipa-users] Web ui error “Your session has expired. Please
             re-login.” from a browser on a remote client.
Sent by:        freeipa-users-boun...@redhat.com




Hi All

I too am suffering from the infamous Web ui error “Your session has
expired. Please re-login.” using from browser(s) on  remote client(s),
similar to the existing tickets:

https://www.redhat.com/archives/freeipa-users/2015-March/msg00211.html
https://www.redhat.com/archives/freeipa-users/2015-February/msg00315.html
https://www.redhat.com/archives/freeipa-users/2015-April/msg00047.html

We have 2 FreeIPA installations:
An “Old”, soon to be decommissioned v3.0.0, on OEL 6.5
The “new” instance, v4.1.0, on a fresh install of OEL 7.0

The error occurs on both instances.

I get the error from OSX and Windows clients (Firefox, Chrome, Safar,i IE
etc)
Very sporadically one of the above browsers will “let me in” - If I cycle
through all the browsers on various workstations / laptops on my desk
somtimes I get lucky and one will work.

kinit in a ssh session works.

SELinux is disabled.

All IPA Services are running.

I can find no error(s) in /var/log/httpd/error_log

In /var/log/krb5kdc.log I get entries like:
Apr 25 02:17:44 ldap2.xxx-xx.xx.xx.com krb5kdc[1933](info): TGS_REQ (6
etypes {18 17 16 23 25 26}) 9.159.8.200: ISSUE: authtime 1429921064, etypes
{rep=18 tkt=18 ses=18}, y...@xxx-xx.xx.xx.com for
HTTP/bsc-ldap2.xxx-xx.xx.xxx....@xxx-xx.xx.xxx.com
Apr 25 02:17:44 ldap2.xxx-xx.xx.xxx.com krb5kdc[1933](info): closing down
fd 12

If I enter a wrong password, I correctly get “The password or username you
entered is incorrect. “, +  errors in /var/log/httpd/error_log

None of the browsers have a krb5 ticket installed.

I get the error with both my user, and the default admin user.

>From the same browsers I can successfully access the Web UI of the public
demo on https://ipa.demo1.freeipa.org/ipa/ui/

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--
Martin Basti

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