Seem to have resolved the issue - issuing the .pfx via IIS instead of certmgr.msc, the certificate was able to be imported. Now running happily on HTTPS.
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Importing a .pfx and I get the error 'Importing CA certificate failed'. I don't know why and I'm not sure where to begin with troubleshooting this as the error message doesn't give me much to go on. Any ideas?
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