SilverTip257 wrote: > On Wed, Jan 15, 2014 at 5:53 AM, John Doe <jdmls at yahoo.com> wrote: > >> From: John R Pierce <pierce at hogranch.com> >> >> >> How to set up timing if NTP was block by ISP? >> > your ISP doesn't have their own timeserver you can access?? >> > I've never heard of an ISP blocking ntp protocol, unless they are >> > blocking /everything/ but web and email via proxy, whereupon they >> > aren't really an internet service provider, they are just a web-n-mail >> > service provider. >> >> Maybe related to the (recent?) DDOS using ntp servers...? > > Sounds likely. > ACLs like that are bad practice, but some people can get overzealous. > Hopefully they're only temporary until the hosts running NTP have been > further secured. > > http://blog.cloudflare.com/understanding-and-mitigating-ntp-based-ddos-attacks > > It is probably a good idea to call and complain to your ISP if this is > happening to you. > > As others mentioned, the OP might be able to sync time off their ISP's NTP > servers (if provided). Or go with a GPS time source as John Pierce suggested. Missed the beginning of this thread. You did try to point to nist.gov? <http://tf.nist.gov/tf-cgi/servers.cgi> mark