Access to resources via UK Access Management Federation

We're having intermittent problems accessing digital library resources via UK Access Management Federation links. Problems have so far been observed with FAME, XpertHR, TRILT and some Dawsonera titles. You may get an error message something like this:

Bad Gateway!
   
      The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /idp/profile/Shibboleth/SSO.

Reason: Error reading from remote server

We are working to solve the problem as quickly as possible.