This issue has now been resolved.
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We are currently experiencing a problem with the EZproxy server which is affecting access to most of our resources.
We are investigating the problem and hope to resolve it soon.
Meantime, staff and students at Borders and Edinburgh campuses can use the resource URL without the EZproxy prefix (i.e. remove http://ezproxy1.hw.ac.uk:2048/login?url= from the front of the URL).