Error on winxp desktops using Outlook 2007/2010 connecting to on premise MS Exchange 2013 server.

We have deployed Exchange 2013 in our network. We can connect using outlook 2010/2013 on Windows 7 OS deskops. Have issues with connecting with Outlook 2007/2010 on windows xp desktops. We get an errror " The action cannot be completed. The connection to Microsoft Exchange is unavailable. Outlook must be onlie or connected to complete this action ".
Amol BaadkarManager - IT OpsAsked:
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suriyaehnopCommented:
Is your Windows XP running on SP3?

Could you try to test Outlook Connectivity by CTRL+Right click on Outlook icon (taskbar) and choose Test-Email Auto configuration, select only "Use AutoDiscover"
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Amol BaadkarManager - IT OpsAuthor Commented:
Yes , my xp is running on sp3. It seesm I have a certificate issue. I'm using KEMP virtual load balancer. If I bypass the load balancer and send traffic directly to CAS server, it works ie I select the pass through option on the load balancer, it works.
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SteveCommented:
XP is out of support and as such is no longer designed to work with exch 2013. there are many issues with it that are not solvable but I suspect yours may be SSL related. XP has trouble with the SSL certs on 2013 and I suspect your loadbalancer is either using its own SSL cert or its not passing the SSL through properly.

have you installed the same cert on the load balancer as is on the exch server?
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Amol BaadkarManager - IT OpsAuthor Commented:
Yes. Same certificate is loaded.
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SteveCommented:
Is the cert a single or a ucc? Is the fqdn the xp machine is connecting to the 'primary name' or an 'alternative'?
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Amol BaadkarManager - IT OpsAuthor Commented:
Hi. Made one change in the KEMP load balancer,  in service tab changed service type from HTTP/HTTPS to Generic. XP clients working now.

Thank you all for the efforts.
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