Minor 
The error is trying to redirect to /grouperExternal/public/UiV2Public.index?operation=UiV2Public.postIndex&function=UiV2Public.error&code=anonymousSessionNotAllowed . But ironically, that page requires authentication to view.
GET https://{host}/grouper/
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GET https://{host}/grouper/grouperUi/app/UiV2Main.index?operation=UiV2Main.indexMain
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GET https://{host}/grouper/grouperExternal/public/UiV2Public.index?operation=UiV2Public.postIndex&function=UiV2Public.error&code=anonymousSessionNotAllowed
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(response cancelled)
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GET https://{host}/grouper/
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GET https://{host}/grouper/grouperUi/app/UiV2Main.index?operation=UiV2Main.indexMain
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GET https://{host}/grouper/grouperExternal/public/UiV2Public.index?operation=UiV2Public.postIndex&function=UiV2Public.error&code=anonymousSessionNotAllowed
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POST https://{host}/grouper/grouperExternal/public/UiV2Public.postIndex?function=UiV2Public.error&code=anonymousSessionNotAllowed
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(401 unauthorized)
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GET https://{host}/grouper/grouperExternal/public/UiV2Public.index?operation=UiV2Public.postIndex&function=UiV2Public.error&code=anonymousSessionNotAllowed&grouperRedirectAuthn=true
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POST https://{host}/grouper/grouperExternal/public/UiV2Public.postIndex?function=UiV2Public.error&code=anonymousSessionNotAllowed&grouperRedirectAuthn=true
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(401 unauthorized)
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GET https://{host}/grouper/grouperExternal/public/UiV2Public.index?operation=UiV2Public.postIndex&function=UiV2Public.error&code=ajaxError&grouperRedirectAuthn=true
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https://{host}/grouper/grouperExternal/public/UiV2Public.postIndex?function=UiV2Public.error&code=ajaxError&grouperRedirectAuthn=true
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(401 unauthorized)
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