[imp] strange session problem

[Julio Molina]

Didi Rieder <adrieder <at> sbox.tugraz.at> writes:

> 
> Hi,
> 
> we just recently added 2 new servers to our Horde/IMP farm. The old servers 
> are running
> under Sparc/Solaris 9 and the new ones under x86/Solaris 10. All theses 
> servers are located behind a Cisco loadbalancer and sessions are stored in 
> a mysql-DB on a separate
> server. The Horde/IMP installation is the same on all the servers (copied 
> from one to all
> the others).
> Now, when a user logs on (IMP is used to authenicate) it gets directed to 
> one of the servers by the loadbalancer. Lets assume it is one of the old 
> server. After clicking a while and reading messages, the loadbalancer 
> directs the request to another server, so far so good. If the request is 
> directed to one of the old (Sparc/Solaris 9) servers everything is fine, 
> but if the request is directed to one of the new (x86/Solaris 10) servers 
> the user gets logged out (imap authenitcation failure).
> If the first login is done on one of the new server, then everything is 
> fine as long as the requests are directed to one of the new server. It 
> fails again if a switch between an old and a new server is done.
> 
> Can someone think of a good reason for this behavior? Or can someone 
> suggest a solution
> for the problem?
> 
> We could use sticky connections using the session cookie, but then the 
> Horde cookie would have to have an uniq prefix for every server (see: 
> <http://makeashorterlink.com?E1FE2187B>) and I don't know how to do that.
> 
> Thanks for any hint
> 
>     Didi
> 

Didi

Have you had any luck solving this issue? I'm having the exact same problem we
have a Cisco CSM Module and 2 Horde/IMP installations. We are having the problem
of users getting logged out due the fact that the loadbalancer sends the session
to a different server. We've tried to configure sticky connections with timers
of 60 minutes and still we are faced with this problem. Our CSM configuration
looks as follows:

 serverfarm WEBMAIL
  nat server
  no nat client
  real X.X.X.X
   inservice
  real X.X.X.X
   inservice
  probe WWW

sticky 3 netmask 255.255.255.255 timeout 60

 vserver WEBMAIL
  virtual X.X.X.X tcp www
  serverfarm WEBMAIL
  sticky 60 group 3
  persistent rebalance
  inservice


I would appreciate any information you can share.