I have installed SSL certificate on my domain but when opening the https://mail.imm.co.kr/owa in chrome browser, it is showing security error. I tried to check across internet but could not find a fix. Please help me.

Your connection is not private

Attackers might be trying to steal your information from mail.imm.co.kr (for example, passwords, messages, or credit cards). NET::ERR_CERT_COMMON_NAME_INVALID


  • To delete a question you can use the "Delete" link right under your question. There is however no need to delete it. If the answer below solved your problem you should accept it. – Gerald Schneider Aug 7 '17 at 12:03

The issue is caused by your SSL certificate installed is not valid for subdomains under the imm.co.kr.

The certificate is for:

  • imm.co.kr
  • immpe.com

What you need is to either have a certificate that includes mail.imm.co.kr or a wildcard certificate that covers *.imm.co.kr.

You should also fix your ciphers, and enable TLS 1.2 + disable SSL2 and SSL3 at the very least, as the connection can be downgraded and attacked rendering the SSL connection insecure.

See https://www.ssllabs.com/ssltest/analyze.html?d=mail.imm.co.kr for more information and recommendations.

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