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I set up a root and intermediate CAs with OpenSSL and started issuing server certificates. For MS RDP (RemoteApp) it required OCSP, so I also set up an OCSP responder with OpenSSL. Testing with openssl ocsp command worked fine, but using MS RDP or even a webserver (IIS) with that issued certificate being accessed by Firefox complained the CA could not be contacted.

I posted everything here, but after a while I realized OpenSSL OCSP manual says this:

The OCSP server is only useful for test and demonstration purposes: it is not really usable as a full OCSP responder. It contains only a very simple HTTP request handling and can only handle the POST form of OCSP queries.

So, I´m guessing I should not use OpenSSL for an OCSP responder? What is the best way to set up one then, preferably using open software and CentOS?

  • As @grawity states below, RDP doesn't require OCSP at all. But if you insist on using one, Primekey's EJBCA has a responder in their open-source and enterprise version. You'd be better off using a CA application (such as EJBCA) rather than OpenSSL if you're serious about security. – garethTheRed Nov 19 '18 at 16:55
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    In fact, RDP doesn’t require OCSP but RemoteApp, which uses RDP requires. I was checking EJBCA but I was trying to stay away from Java. Then I saw OpenCA and DogTag. I may try to use one of them. – Adriano_epifas Nov 19 '18 at 17:39
  • DogTag also requires Java unfortunately :-( – garethTheRed Nov 20 '18 at 8:36
  • Although I'm not directly answering your question, I've just installed RemoteApps on a Server 2008R2 lab (it was convenient) and there was no requirement to use OCSP. Which version of Windows are you using? – garethTheRed Nov 20 '18 at 21:23
  • @garethTheRed, The server is Windows 2012R2. I was sure to add a certificate without the "Authority Information Access:" extension. I added it to "RD Connection Broker - Enable Single Sign On" and "RD Connection Broker - Publishing". Still, when I try to connect it says "A revocation check could not be performed for the certificate" – Adriano_epifas Nov 28 '18 at 18:56

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