again that’s very basic load balancing in kemp(just for record I love zen) there is a special option called killed “dead” connection to failed back end. when this is enabled the existing connections are either rejected or dropped causing the client (since its connection are closed) to re-connect and when it does it hit a “live” back end(CAS)
From: Emilio Campos Sent: Wednesday, January 30, 2013 2:02 PM To: [email protected] Subject: Re: [Zenloadbalancer-support] Exchange 2013 support Hi, Andreas is right, it is an application issue, not LB issue, the LB's job is to redirect the client to one backend, if this backend goes down the LB has to ensure the client will be sended to other backend, that is all. Regards 2013/1/30 Andreas M. Iwanowski <[email protected]> It will monitor the backends and take unresponsive ones offline. Of course the MAPI session state will be shot, but it is up to the client to then reconnect. The same goes for SMTP, POP3, and IMAP. A reconnect should be required, but this is up to the client. Outlook 2010 works great for this, 2007 seems to require a restart to successfully reconnect (different LB, but this seems to be an application issue, not an LB issue). Webmail shouldn’t be affected at all, although you may end up back at the login screen. Mit freundlichen Grüßen / With best regards Andreas Iwanowski - IT Administrator / Software Developer www.awato.de | [email protected] T: +49 (0)2133 2969 28 | F: +49 (0)2133 2969 69 awato Software GmbH | Salm Reifferscheidt Allee 37 | D-41540 Dormagen avisor-Support | T: +49 (0)621 6094 043 | F: +49 (0)621 6071 447 Geschäftsführer: Ursula Iwanowski | HRB: Neuss 7208 | VAT-no.: DE 122796158 From: Turbomcp [mailto:[email protected]] Sent: Saturday, January 26, 2013 4:07 PM To: [email protected] Subject: Re: [Zenloadbalancer-support] Exchange 2013 support I saw that option but from what I understood(maybe I'm wrong) its just away to guard the farm it doesn’t handle killing client session on a “dead” backend From: Andreas M. Iwanowski Sent: Saturday, January 26, 2013 7:47 AM To: [email protected] Subject: Re: [Zenloadbalancer-support] Exchange 2013 support Have you looked into the FarmGuardian monitoring? This seems to be what you’re looking for I think. Mit freundlichen Grüßen / With best regards Andreas Iwanowski - IT Administrator / Software Developer www.awato.de | [email protected] T: +49 (0)2133 2969 28 | F: +49 (0)2133 2969 69 awato Software GmbH | Salm Reifferscheidt Allee 37 | D-41540 Dormagen avisor-Support | T: +49 (0)621 6094 043 | F: +49 (0)621 6071 447 Geschäftsführer: Ursula Iwanowski | HRB: Neuss 7208 | VAT-no.: DE 122796158 From: Turbomcp [mailto:[email protected]] Sent: Friday, January 25, 2013 10:00 PM To: [email protected] Subject: [Zenloadbalancer-support] Exchange 2013 support Hi there I just found zen by mistake what an awesome project amazing really , im really impressed compared to other production “big companies” I have tested. ok, so im testing exchange 2013 and it is supposed to be even easier then 2010 load balancing was basicly only need source ip persistance the thing is I tried to use https and importing my cert but it doesn’t work(ssl bridging) so I said what the heck I don’t really need bridging I can just use basic tcp 443 and that works fine BUT when one of my cas server is down it doesn’t kill existing connections to that server and that causes clients to “hang” wait for the cas server. to come back. any chance to have some documentation for exchange 2013 ? or an option to kill existing tcp /udp connections on back end server failure? 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