Verify that your IIS security is set correctly.
IIS Settings
Default Web site
Enable Anonymous access
Integrated Windows Authentication
Exadmin
Integrated Windows Authentication
Require SSL
Require 128 bit
Exchange
Basic Authentication
Default Domain \
Exchange-oma
Integrated Windows Authentication
Basic Authentication
ExchWeb
Enable Anonymous access
Require SSL
Require 128 bit
Microsoft-Server-ActiveSync
Scripts and Executables
Exchange Application Pool
Basic Authentication
Default Domain DomainName
OMA
Scripts Only
ExchangeMobileBrowseApplicationPool
Basic Authentication
Default Domain DomainName
Public
Basic Authentication
Default Domain \
Require SSL
Require 128 bit
When you are done verifying the settings and if there is still a problem, run through the forms based auth setup again.
I hope you find this post helpful.
Regards,
Mark
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