Popup for credentials when connecting to OWA/ECP when using HLB DNS name

Hi,
We're experiencing a strange problem when connecting to OWA/ECP.
Since a week or two, we get a popup for credentials when logging onto
https://mail.customer.com/owa.
When the credentials are filled in the first time, we keep receiving the popup, and can't get through.
We're using integrated authentication internally.
When connecting externally, we get a popup from a non domain-joined pc,  but get passed correctly to owa and ECP.
We're using a load balancer that uses mail.customer.com, and distributes it over the 3 exchange servers.
When connecting directly to each exchange server, we get a certificate warning (which is logic), but after confirming we get passed to ecp or owa correctly.
Works :
https://exchangeserver1.customer.com/owa (after receiving certificate warning)
https://exchangeserver2.customer.com/owa (after receiving certificate warning)
https://exchangeserver3.customer.com/owa (after receiving certificate warning)
https://10.10.10.30/owa (after receiving certificate warning) > 10.10.10.30 is the VIP ip address used for loadbalancing
Doesn't work :
https://mail.customer.com/owa
When changing the hosts file, and set mail.customer.com to point directly to one of the exchange servers, it doesn't work either.
PS :
So mail.customer.com gets forwarded to the VIP ip address.
We don't experience any problems with outlook.

Hi
Chek if VIP FQDN is added to DNS
Check if RpcClientAccessServer parameter using Set-MailboxDatabase for each mailbox database in the appropriate site
Set-MailboxDatabase -RPCClientAccessServer "CASArrayFQDN"
Change AutoDiscoverServiceInternalUrl on each CAS using Set-ClientAccessServer
Change InternalUrl parameter on each CAS using Set-WebServicesVirtualDirectory Identity EWS*in the appropriate site
Change the InternalURI in the Exchange Control Panel, offline address book, and Microsoft Exchange ActiveSync (through management console under server management for each appropriate CAS)
Please mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you.
Regards,
Sathish

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