How many levels of Sub-CA chaining are supported in Sentry CA 3.x?
2 years ago
Originally Published: 2001-07-24
Article Number
000055190
Applies To
Sentry CA 3.x
TechNote 0131
Issue
How many levels of Sub-CA chaining are supported in Sentry CA 3.x?
Have the Sub-CA chaining more than 11 levels.
When starting Sentry CA services, the following error message appears:
The secure directory server does not appear to be reachable.  Remember that you must start it before attempting to start the Web server. You will be unable to make client-authenticated connections to this server until you restart it with a running directory server.

test.xxxxx.com: error setting default verify locations:
[unable to contact directory server]
Cause
Sentry CA supports up to 11 chained CAs.  Exceeding this limit will result in the above error message on startup.
Resolution
Do not setup the Sub-CA chaining for more than 11 levels.

For Netscape browsers to correctly follow this chain, all intermediate CAs must have the appropriate netscape_cert_type extension for the given protocol.  So for SSL, intermediate CAs MUST have bit 5 (SSL CA) asserted (similarly, for S/MIME, intermediate CAs would need bit 6 - S/MIME CA - asserted).  The Root CA does not need this assertion.