ive done some testing and found below, ive sent it back to mihome
Ive tried the following in my code
https://www.yalehomesystem.co.uk/homeportal/api/login/check_login/ – I get a response
https://wap.tplinkcloud.com – I get a response
http://www.transat.com – I get a response (certificate was issued by Comodo like yours)
https://renderloop.com - avax.net.ssl.SSLException: java.security.ProviderException: java.security.InvalidKeyException: EC parameters error (they were listed on the SSL checker under SANs: ssl389385.cloudflaressl.com,
https://image-charts.com - avax.net.ssl.SSLException: java.security.ProviderException: java.security.InvalidKeyException: EC parameters error (some on else on smartthings having error) but on cloudflaressl.com
https://mihome4u.co.uk/ - javax.net.ssl.SSLException: java.security.ProviderException: java.security.InvalidKeyException: EC parameters error
please note
http://mihome.co.uk (not https) I get a Status: 301 not an Exception in smartthings
There is defiantly something different with cloudflaressl.com security setup (might be of note the 3 error sites only have 66 to 84 days left on the Comodo certificate