How to install Comodo Positive SSL

We receive multiple messages from our customers, who experience problems with Installing Comodo SSL certificates, so we decided to post manual. The most popular problem is that SSL is not working on mobile devices or in some browsers, its happening as you miss to install Intermediate-CA files.

When SSL is issued, you receive 3 files that you need to use, you can also download them from the mail you received from Comodo.

  • -AddTrustExternalCARoot.crt (CA file that makes working SSL in all browsers and mobile devices)
  • -PositiveSSLCA2.crt or COMODOHigh-AssuranceSecureServerCA.crt (Main CA file)
  • -www_yourdomainname.crt (Your SSL)
  1. First, you need to combine two CA files in one, its very easy, all you need to do is to open both files (AddTrustExternalCARoot.crt + PositiveSSLCA2.crt/COMODOHigh-AssuranceSecureServerCA.crt) in any Text editor like Notepad, and copy/paste the codes one by one in one file and save it. Now you will have 1 file with SSL CA, we need that, as only few system allow to install 2 separate files, most of them allow just one file
  2. No we have all files, so all we need is just to use manuals to install: https://support.comodo.com/index.php?_m=knowledgebase&_a=view&parentcategoryid=95
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