problem with the ios certificate server does not update the CRL

Hi all

The background is that I'm putting a DMVPN solution with tunnels ipsec between the rays created by using certificates.

I use a cisco 877 as the CA server (its 12.4 (6) T5) running to provide certificates for the spoke routers. This part works very well - rays can apply for a certificate and get a number very well.

The problem is CA, life of LCR is set to 24 hours, but the CA is not updated the LCR so when the rays see CRL (as defined in their trustpoint) they point to a mistake that the CRL is obsolete and does not connect.

If making a ' #sh cryptographic pki server ' it lists a ' CRL NextUpdate timer. It has a timestamp that is 24 hours after the last certificate was revocked. The only way I can get the LCR to be rebuilt must revoke a certificate.

So, my question is, am I missing something here? I thought that it would automatically generations a new CRL list file every 24 hours.

Can anyone help?

Thank you.


Hey Marc (?)

This seems to correspond to this bug:

CSCsy95838    AC IOS: LCR of the not updated, update timer not started

However, it does not mention if 12.4 (6) T5 is affected, only that it was found 12.4 (15) T3 and resolved to 12.4 (15) T10 and other more recent versions.

I suggest trying the last 12.4 (15) Tx, 15.0 (1) Mx or 15.1 (4) Mx version if you can.

I assumed that you have much of it, but just in case: as a workaround, you can disable CRL checking on all routers DMVPN, of course they will still allow connections from routers with a revoked RADIUS.

As (temporary?) substitute for a Revocation list, you can use a 'certificate ACL' with which you can create kind of a 'local CRL Manual:

  crypto pki certificate map certACL 10    serial-number ne    serial-number ne    etc. 

  crypto pki trustpoint myTP
   match certificate certACL
(note the "ne" stands for "not equal" so you are permitting any certificate whose serial number is not listed)
Of course, you would have to configure (and maintain!) participating on each router in the DMVPN so it's heavy, but I guess if you revoke often certs, that it might be an option.


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Tags: Cisco Security

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