Just upgraded our GW2014 to R2SP2, all seems to going well except that login to Webaccess fails on devices that default to the basic interface (eg Android 5).
If you force the browser to use mobile interface with gw/webacc?User.interface=mobile, then the login works, on the same device!!
I've done a DSTrace on our eDir server and the LDAP authentication succeeds for the basic interface, but the user gets an incorrect username/password error in the web browser.
On my Android 6 device, webaccess defaults to the mobile interface & login works, but Android 5 and IOS 10.2.1

Has anyone else experienced this issue?