Newcastle University uses a series of technologies for managing outgoing web access. As a result, connections from Newcastle University to external websites appear to originate from a small set of source addresses. If someone on campus does something bad, for example running aggressive web spider software to cross-index Google, or arXiv.org, the remote site may block or otherwise rate-limit connections from Newcastle. These consequences can be wide-reaching.

If you find this happening to you, please report the issue to the support team, as the proper solution is to identify the culprit, stop the errant behaviour and get the remote block removed.

Potential short-term work-around

Any outgoing connection on port 80 (a website request) is transparently proxied. If you find that you are blocked from an external site, a short-term fix might be to manually configure your web client to use a different web proxy.

The address wwwcache.ncl.ac.uk (and port 8080) is a service address for an on-campus HTTP proxy. It is not used by default (transparently proxied web requested appear to originate from different addresses to manually proxied web requests).

Here are some external sites offering instructions on altering your proxy settings:

UNIX environments

Much UNIX software supports the http_proxy environment variable:

$ http_proxy=http://wwwcache.ncl.ac.uk:8080; export http_proxy