topic Re: NTP Sync Failure CISCO ISE in Network Security

NTP Sync Failure CISCO ISE

tmarques87 — Fri, 21 Feb 2020 12:46:51 GMT

hello guys,

I'm having problems with the cisco ise in my company.

every day is got the following error:

Cause: No NTP Server reachable from SPCISE01

Details: All of the NTP Servers configured on this node are unreachable. If NTP authentication is configured ensure that key ID and value match that of the server. Execute 'show ntp' from CLI for troubleshooting.

admin# show ntp

Configured NTP Servers:

10.0.4.6

synchronised to NTP server (10.0.4.6) at stratum 7

time correct to within 556 ms

polling server every 256 s

remote refid st t when poll reach delay offset jitter

==============================================================================

127.127.1.0 .LOCL. 10 l 49 64 377 0.000 0.000 0.001

*10.0.4.6 10.0.4.4 6 u 1 256 377 2.133 6.875 8.734

* Current time source, + Candidate

Warning: Output results may conflict during periods of changing synchronization.

how can I force the sync ntp in ise?

NTP Sync Failure CISCO ISE

venkata dandu — Thu, 24 Jan 2013 15:08:03 GMT

We are having the same problem, have you managed to find any solution for this issue?

NTP Sync Failure CISCO ISE

Michael.Bienkowski — Mon, 29 Jul 2013 18:03:12 GMT

I am also having this issue. Every 15 minutes I get alarms. Tried differnt NTp servers 0 AD, external, etc.. with no luck. I am hoping someone has made progress in resolving this issue.

Re: NTP Sync Failure CISCO ISE

Andreas Hoffmann — Thu, 26 Sep 2013 12:17:20 GMT

We are having the same issue. What's worst: The error is reported as CRITICAL and the description says that "No NTP Server reachable" (or that "All of the NTP Servers configured on this node are unreachable") and this is clearly wrong.

Running "sho ntp" about one hour after the error message clearly shows that only one out of three configured redundant ntp sources had a temporary problem:

Configured NTP Servers: 
  10.0.1.119
  pool.ntp.org
  de.pool.ntp.org

synchronised to NTP server (91.64.203.19) at stratum 2 
   time correct to within 54 ms
   polling server every 1024 s

     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 127.127.1.0     .LOCL.          10 l   27   64  377    0.000    0.000   0.001
+10.0.1.119      217.79.179.106   3 u  224 1024  367    0.234  -27.926   6.174
+89.163.176.81   178.63.97.57     3 u   95 1024  377   10.224   -4.777   0.533
*91.64.203.19    .PPS.            1 u  348 1024  377   29.527    0.121   3.608

* Current time source, + Candidate 

Warning: Output results may conflict during periods of changing synchronization.

Given that non-reachability of single hosts is something the ntp protocol is specifically designed for, issuing a "critical" message in a far-from-critical situation (it's not even an "error", it should be at most a "warning" I guess) is very annoying.

Re: NTP Sync Failure CISCO ISE

Michael.Bienkowski — Thu, 26 Sep 2013 12:54:14 GMT

Hi,

I resolved this issue by setting up NTP on our core switch 6513 and pointing ISE towards that. We got the same errors you are seeing when using an AD server for NTP. Since moving I have not gotten any NTP errors.