Proxy rediredt for all NCBI services
Perhaps the problem is not with Zotero - I don't fully understand it at the moment. I think the situation is something like this: to make it easier to download journal articles, Zotero connects me to my University's servers which then act as a proxy. When I need to do this, I have to enter my University credentials at a University login screen (www.ease.ed.ac.uk). This is fine for downloading journal articles. However, I'm also confronted with this login screen for other NCBI services such as Primer-Blast which are publicly available without a subscription (so I don't benefit from signing in). Is there any way to prevent me from having to sign in to use services where there's no benefit? Is this a Zotero issue or an issue for which my University's IT department are responsible?
You can star by looking at the entries in the proxy tab of the Zotero preferences.
You'll likely have one or two proxy settings listed - double click for a list of all sites that proxy is inserted into - delete the ones you don't want.
That might do the trick already.