Long user-agent string breaks Fidelity NetBenefits/eWorkplace

I came upon an issue recently that I thought I would share with you in hopes that it will prevent some headaches in the future.
I recently lost my ability to login to eWorkplace and NetBenefits.  I tried several URLs netbenefits.com, 401k.com, eworkplaceservices.fidelity.com etc. all of which resulted in the following message that appeared before any [...]