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Evan WilleyEvan Willey 

SSL Callouts: Untrusted Intermediate CA. Any way around this other than a proxy?

I am getting this error when sending an HTTP request to a webservice I have to use: 
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Unable to forward request due to: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
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SSL Labs agrees that there is something wrong with the certificate: https://www.ssllabs.com/ssltest/analyze.html?d=hos.myshawtracking.ca

After doing a lot of googling and testing, so far as I can tell, Salesforce will not allow callouts to servers where the certificate is not authenticated at every level by a root CA.https://help.salesforce.com/articleView?id=000007225&language=en_US&type=1
Since I do not have access to the salesforce servers, I cannot add them to the trusted list https://success.salesforce.com/ideaView?id=08730000000JziE; and since I do not have access to the webservice servers, I can't merge and load my own certs https://help.salesforce.com/articleView?id=000204513&language=en_US&type=1.
All other salesforce and forum discussions regarding this exception have been of no help.

Since salesforce support is useless and you can't log a development case with them, anyone on here know if there is anyway to get around this without using a proxy or custom webapp of some sort?