All,
We are seeing intermittent 401 errors (The HTTP request is unauthorized with client authentication scheme 'Negotiate'.)
This error is not at all consistent. A user can generate queries all day long and then will get the error message. The error doesn't occur on a specific report, in a specific model, or with a specific data intersection. The error happens with all users accessing the environment. The error also occurs in two different environments.
The error seems to correspond to a loss of communication in the IIS communication process. The IIS log indicates that a 401 error is generated when the client losses connectivity (the fully qualified user ID and IP address of the client are no longer passed to the application from the client and only the IP address is passed to the application).
Given how intermittent the error is, my inclination is to suspect that the application installation has become corrupted somehow, as system settings would most likely not result in inconsistent error messaging.
Has anyone seen anything similar?
