A question about AD CS and Kerberos 'Domain Controller' Template certificates

-

can please me following question.

in active directory domain kerberos used authentication , kdc distributes symmetric session keys. installation of ad cs (active directory certificate services, asymmetric encryption) ‘optional’ component meaning ad/kerberos function fine without ad cs.

i have ad domain 2003 r2 (lab) ad cs installed (2003 r2 also) installed 1 server. server has not been switched on while , see following kdc waring in event log

the selected kdc certificate once valid, invalid , no suitable replacement found.  smartcard logon may not function correctly if problem not remedied.  have system administrator check on state of domain's public key infrastructure.  chain status in error data.

which leads me following ms article (all 2008 pretty sure same issue)

https://technet.microsoft.com/en-us/library/cc733985(v=ws.10).aspx

looking @ local machine/personal store on server see couple of certificates both issued 2003 r2 ca, 1 of template “domain controller”. understand not have configure distribution of certificates dcs based on template automatic when install ad cs.

my question if kdc complaining cert , wants new 1 ca, how kdc work when no ca exists (as ca optional).

 also not sure certificate (for asymmetric encryption) fits in, understand kcd encrypts session keys using hash of user (upn) password (for tgt) , hash of user , service (upn , spn) service ticket. unless certificate used initial authentication service (as) stage when believe client encrypts current date , time , sends as,  as authenticator (or other way around), again thought encrypted using password hash upn password hash.

 can please explain (or point me article explain this) x509 certificate fits in overall kerberos authentication scheme.

thanks all

ernie 

this related optional configuration. normal kerberos authentication works fine without ca or ca issued certificate. if dc proper certificate, dc can used authenticate smart card logons. without cert - dc unable participate in kind of authentication. there newer template called kerberos authentication replaces domain controller , domain controller authentication templates providing same functionalities, enables clients optionally verify id of kdc. requires cng (vista) or newer client take advantage.

mark b. cooper, president , founder of pki solutions inc., former microsoft senior engineer , subject matter expert microsoft active directory certificate services (adcs). known “the pki guy” @ microsoft 10 years. connect mark @ http://www.pkisolutions.com



Windows Server  >  Security



Comments

Post a Comment

Popular posts from this blog

Round Robin is killing performance on our network

-
Image
we had 2 windows 2003 domain controllers @ our data center dns , 1 domain controller @ our large remote office no dns. finished replacing 3 domain controllers windows 2012 r2 dc's, each of have dns installed , configured. we're having issues servers @ our data center resolving names using dns server @ remote office due appears round robin dns lookups. is there suggested way force servers , workstations @ data center use domain controllers @ location dns resolution , servers , workstations @ remote office use domain controller @ location dns resolution? thanks in advance assistance, dan hi dbetanco, >we're having issues servers @ our data center resolving names using dns server @ remote office due appears round robin dns lookups. round robin specific record query, example, in dns zone has 3 records: www.test.com 1.1.1.1 www.test.com 2.2.2.2 www.test.com 3.3.3.3 then if query nslookup www.test.com  three times, first time order is: 1.1....
Read more

WMI Repository 4GB limit - Win 2003 Ent Question

-
Image
hi there, i've question size limit on wmi repository (being 4gb). if isn't correct place post this, apologies , can let me know wheere post this? i've come across few servers running citrix have reached limit on wmi repository size , need install ibm director agent hw monitoring. during install getting 'out of disk space' errors entered in mofcomp.log: "(mon apr 02 04:10:36 2012.172843) : error occurred while processing item 4: (mon apr 02 04:10:36 2012.172843) : error number: 0x8004103b, facility: wmi description: out of disk space" when error number http://msdn.microsoft.com/en-us/library/windows/desktop/aa394559%28v=vs.85%29.aspx i see this: wbem_e_out_of_disk_space 2147749947 (0x8004103b) disk out of space or 4 gb limit on wmi repository (cim repository) size reached. windows xp , windows 2000/nt:   disk out of space. i'm wondering if there reason why limit set 4gb or can increase needs be? can't seem find reas...
Read more

Change home folder default permission?

-
i have searched on , can't seem find similar trying do. using windows server 2003 active directory. when create new user account on domain, use profile tab specify home directory user. when user logs in first time, active directory creates folder in specified path. working correctly. problem gives user full control on folder. has caused lot of problems because "clever" users have discovered thay can change permission on folder or subfolders beneath it. because don't want staff looking @ "sensitive" files. of course doesn't work since can take ownership of file , give myself permissions. causes trouble failed backups, inability scan these folders viruses, migration new storage etc. on occasion 1 of these users call me , ask file or folder restored, , @ point discover not have backup of files , cannot restore them. give them lecture, have on 2500 users, , can't talk them all. right have create account , login teh folder created, go take away full contr...
Read more