Exchange 2016 OWA promt for password twice and sometimes three times

All our clients are going trough a KEMP load balancer.
For some reason when clients try to access their email through the owa they are prompt for their password twice even sometimes a third time.
1 The user types in their username and password, click enter. The login screen appears again.

2 The user types in their username and password, click enter. The login screen appears again.

3 The user types in their username and password, click enter. They are able to login

Help?
ITbrandAsked:
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ITbrandConnect With a Mentor Author Commented:
The solution was to update Exchange to CU2 and install the certificate in the Load Balancer.
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Vince GlissonOwnerCommented:
On the load balancer, how many lines are on it.

If you try to open OWA off this network does it work as expected?
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ITbrandAuthor Commented:
How many lines?
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Vince GlissonOwnerCommented:
I was thinking of ISP load balnacer's which have multiple internet lines coming in that appear as one, so i have seen this issue with them as the request going to OWA is generated through all the lines that come in so on the way back it prompts for a password for each one.

It may be a similar instance happening with the kemp.

I am not familiar with the Kemp though.
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Simon Butler (Sembee)ConsultantCommented:
First thing to do when you are using a load balancer is by pass it.
Does the same behaviour occur?

Was the Kemp setup with their templates, or was it manually setup?

Without knowing if the issue occurs when the Kemp is bypassed, it is hard to say whether the issue is the server or the load balancer.

For example, if the virtual directories have been touched and are no longer default then the behaviour you are seeing can be seen.
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