Because Springshare has turned on an HSTS policy telling your browser that any web site under the "opal-libraries.org" domain (OPAL website, and your local proxy is a subdomain) should always use https, it can create an issue for the proxy server, particularly where the URL to the proxied site, e.g., EBSCO, is not https. It's currently most likely to happen when you search your EDS using Chrome. Here's an example for Ursuline.
The proxy server's certificate is only good for subdomains of uc.opal-libraries.org, e.g., https://search-ebscohost-com.uc.opal-libraries.org, but not subdomains of subdomains of uc.opal-libraries.org, e.g., https://search.ebscohost.com.opal-libraries.org, so it appears as a security issue.
Where that's the case, you should be able to resolve the problem by doing the following:
Unfortunately, the problem will likely recur when you go to the OPAL web site and then at some point later try to access an http link through the proxy. To clear the error repeat the steps above.
We are currently working on a solution that will likely involve a change to the OPAL web site URL and putting redirects in place. This will take a while to implement, but know that we will have a fix in place as soon as we can.
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