William, investigating this more from our end, our team was able to help us with this issue, BUT, they were able to determine that there IS an issue with the site's certificates. Here is a result from an independent SSL diagnostic tool indicating there is an error related to the certificate chain: https://www.sslshopper.com/ssl-checker.html#hostname=https://knowledgebase.constantcontact.com/ “The certificate is not trusted in all web browsers. You may need to install an Intermediate/chain certificate to link it to a trusted root certificate.” Passing this on in hopes that it is helpful for your team. Correcting the issue may help others with similar network security configurations.
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