RE: [condor-users] Windows Condor disappearing/reappearing on gri d

[Mark Silberstein <marks@xxxxxxxxxxxxxxxxxxxxxxx>]

No, not that I know. Actually, I understood that we were talking about
Windows only after I had sent the message ;)

On Mon, 2003-11-17 at 16:14, Heinz, Michael William wrote:
> Does Windows 2000 use NTP?
> 
> -----Original Message-----
> From: Mark Silberstein [mailto:marks@xxxxxxxxxxxxxxxxxxxxxxx] 
> Sent: Saturday, November 15, 2003 4:19 AM
> To: condor-users@xxxxxxxxxxx
> Subject: RE: [condor-users] Windows Condor disappearing/reappearing on gri d
> 
> 
> Hi,
> I had quite a similar problem I'd reported about to condor-admin. 
> I had an NTP (network time protocol) daemon running in the background and
> changing time. So during the startd invocation it had one time stamp, but
> then, when the time change happened due to NTP, startd was stopping sending
> its classads. Tuning NTP to start before Condor in the startup scripts
> solved the problem. 
> Mark
> On Fri, 2003-11-14 at 19:43, Heinz, Michael William wrote:
> > Zach,
> > 
> > 	Thanks for the response - I am seeing "invalid session" messages in 
> > the collector log.
> > 
> > 	I'll try your suggestion, but I am, in fact, using Condor 6.5.5, so 
> > it looks like that problem hasn't been fixed after all. Do I need to 
> > put the fix in all condor configs or just on the machine running the 
> > collector?
> > 
> > -----Original Message-----
> > From: Zachary Miller [mailto:zmiller@xxxxxxxxxxx]
> > Sent: Friday, November 14, 2003 12:29 PM
> > To: condor-users@xxxxxxxxxxx
> > Subject: Re: [condor-users] Windows Condor disappearing/reappearing on
> grid
> > 
> > 
> > On Fri, Nov 14, 2003 at 12:13:01PM -0500, Heinz, Michael William 
> > wrote:
> > > No one ever responded to this problem, so I'm asking again:
> > > 
> > > I seem to be in a situation where machines disappear off the grid 
> > > even
> > > though they are both idle and continuing to operate. Rebooting each 
> > > machine in question seems to relieve the problem. More strangely, it 
> > > sometimes seems as if simply logging into the machine and doing a 
> > > "condor_status" and waiting a few minutes is all that's needed.
> > > 
> > > Does anyone have any suggestions?
> > 
> > it looks like you are running into a bug with sessions expiring.  i'm 
> > guessing that if you look in your CollectorLog, you'll see a bunch of 
> > lines saying "attempt to open invalid session".
> > 
> > the bug was fixed in the 6.5 series.
> > 
> > if you'd like to work around it, you can turn off sessions entirely if 
> > you are not using KERBEROS, X509, 3DES, BLOWFISH, MD5, or any other 
> > security features.  simply add:
> > 
> >   SEC_DEFAULT_NEGOTIATION = NEVER
> > 
> > to your condor_config file.  let me know if you continue to have 
> > troubles.
> > 
> > 
> > cheers,
> > -zach
> > 
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> > http://www.cs.wisc.edu/condor/condor-support/
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