Mailing List Archive: NT Broadcaster problems

NT Broadcaster problems

Jan 14, 2004, 10:08 AM

Post #1 of 4 (2522 views)

We have just set up NT Backhand Broadcaster on 4 XP machines

We have two SuSE Linux machines running Apache 1.3.28 and mod_backhand 1.2.2
which are correctly working.

When the status page is accessed (http://localhost/backhand/) the stats that
are returned from the 2 Linux machines are correct, but the stats which are
returned from the XP machines look garbled.
The hostname and age appear correct.
The IP address is correct but the port is listed as 0 not 80
Total Mem is listed as 1MB; Avail Mem is listed as 1073201152 MB.
Arriba is 0; #CPUs is 1000; Load/HWM is 0.000/0 and CPU Idle is 0.000

Checking the registry settings on the XP machines everything looks good -
the Arriba score is 673266000.

Backhanding is working between the two linux boxes but it never goes to the
XP machines. Instead an apache Internal Server Error is received. Checking
the apache error log an entry of "Request exceeding the limit of internal
redirects" is listed.

Is this anything to do with the NT Backhand stats being garbled - ie. a port
of 0 meaning the server cannot proxy?

Using HTTPRedirectByName works; HTTPRedirectByIP fails (I assume again due
to the port number)

Any ideas would be greatly received

Neil Dawkins

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NT Broadcaster problems [ In reply to ]

robert.butler5 at verizon

Jan 14, 2004, 12:02 PM

Post #2 of 4 (2416 views)

Permalink

Theo, have there been any changes to the broadcast data structure in newer version of Backhand? If so the NT Backhand Broadcaster code would need to be updated to include the changes.

Other than that make sure your settings in the registry for NT BHB are correct. It looks like the broadcast data structure after the IP address is having a problem. This could be because a required piece of data is missing in the registry or if the backhand data structure changed, and the change was not duplicated to NT BHB.

Let's wait for a message from Theo confirming if there were / were not changes to the broadcast data structure, and meanwhile you can double check your settings. If neither of those two yeild any results I can take a look at the NTBHB code -- it's been a while...

Later
Rob
>
> We have just set up NT Backhand Broadcaster on 4 XP machines
>
> We have two SuSE Linux machines running Apache 1.3.28 and mod_backhand 1.2.2
> which are correctly working.
>
> When the status page is accessed (http://localhost/backhand/) the stats that
> are returned from the 2 Linux machines are correct, but the stats which are
> returned from the XP machines look garbled.
> The hostname and age appear correct.
> The IP address is correct but the port is listed as 0 not 80
> Total Mem is listed as 1MB; Avail Mem is listed as 1073201152 MB.
> Arriba is 0; #CPUs is 1000; Load/HWM is 0.000/0 and CPU Idle is 0.000
>
> Checking the registry settings on the XP machines everything looks good -
> the Arriba score is 673266000.
>
>
> Backhanding is working between the two linux boxes but it never goes to the
> XP machines. Instead an apache Internal Server Error is received. Checking
> the apache error log an entry of "Request exceeding the limit of internal
> redirects" is listed.
>
> Is this anything to do with the NT Backhand stats being garbled - ie. a port
> of 0 meaning the server cannot proxy?
>
> Using HTTPRedirectByName works; HTTPRedirectByIP fails (I assume again due
> to the port number)
>
> Any ideas would be greatly received
>
> Neil Dawkins
>
>
> ________________________________________________________________________
> This e-mail has been scanned for all viruses by Star Internet. The
> service is powered by MessageLabs. For more information on a proactive
> anti-virus service working around the clock, around the globe, visit:
> http://www.star.net.uk
> ________________________________________________________________________
>
> _______________________________________________
> backhand-users mailing list
> backhand-users@lists.backhand.org
> http://lists.backhand.org/mailman/listinfo/backhand-users
>

NT Broadcaster problems [ In reply to ]

neil.dawkins at corpdata

Jan 15, 2004, 2:47 AM

Post #3 of 4 (2411 views)

Permalink

We have managed to resolve the problem, and all is now working correctly.

By packet sniffing the broadcasts from both the linux machines and the XP
machines we discovered that the data section of the XP packet was 4 bytes
longer than that of the linux machines.

Hence, we patched the NTBHB code to reduce the size of the data section to
100 bytes to match that of the packets from the linux machines.
t_time needed to be padded to 64 bits.
The structure of the sckaddr_in structure differed between XP and linux, so
we adjusted it to reproduce a linux packet.

Rob, The patch is not elegant, but it works for us. If you would like us to
post the patch then let me know.

Neil

> Theo, have there been any changes to the broadcast data structure
> in newer version of Backhand? If so the NT Backhand Broadcaster
> code would need to be updated to include the changes.
>
> Other than that make sure your settings in the registry for NT
> BHB are correct. It looks like the broadcast data structure
> after the IP address is having a problem. This could be because
> a required piece of data is missing in the registry or if the
> backhand data structure changed, and the change was not
> duplicated to NT BHB.
>
> Let's wait for a message from Theo confirming if there were /
> were not changes to the broadcast data structure, and meanwhile
> you can double check your settings. If neither of those two
> yeild any results I can take a look at the NTBHB code -- it's
> been a while...
>
> Later
> Rob
> >
> > We have just set up NT Backhand Broadcaster on 4 XP machines
> >
> > We have two SuSE Linux machines running Apache 1.3.28 and
> mod_backhand 1.2.2
> > which are correctly working.
> >
> > When the status page is accessed (http://localhost/backhand/)
> the stats that
> > are returned from the 2 Linux machines are correct, but the
> stats which are
> > returned from the XP machines look garbled.
> > The hostname and age appear correct.
> > The IP address is correct but the port is listed as 0 not 80
> > Total Mem is listed as 1MB; Avail Mem is listed as 1073201152 MB.
> > Arriba is 0; #CPUs is 1000; Load/HWM is 0.000/0 and CPU Idle is 0.000
> >
> > Checking the registry settings on the XP machines everything
> looks good -
> > the Arriba score is 673266000.
> >
> >
> > Backhanding is working between the two linux boxes but it never
> goes to the
> > XP machines. Instead an apache Internal Server Error is
> received. Checking
> > the apache error log an entry of "Request exceeding the limit
> of internal
> > redirects" is listed.
> >
> > Is this anything to do with the NT Backhand stats being garbled
> - ie. a port
> > of 0 meaning the server cannot proxy?
> >
> > Using HTTPRedirectByName works; HTTPRedirectByIP fails (I
> assume again due
> > to the port number)

________________________________________________________________________
This e-mail has been scanned for all viruses by Star Internet. The
service is powered by MessageLabs. For more information on a proactive
anti-virus service working around the clock, around the globe, visit:
http://www.star.net.uk
________________________________________________________________________

NT Broadcaster problems [ In reply to ]

robert.butler5 at verizon

Jan 15, 2004, 7:53 AM

Post #4 of 4 (2421 views)

Permalink

Yes, post it to the list. Thanks for tracking it down. It all worked fine when tested on Win NT / 2k. Did the size of the time_t or sckaddr_in structure change between NT and XP?

Later
Rob
>
> We have managed to resolve the problem, and all is now working correctly.
>
> By packet sniffing the broadcasts from both the linux machines and the XP
> machines we discovered that the data section of the XP packet was 4 bytes
> longer than that of the linux machines.
>
> Hence, we patched the NTBHB code to reduce the size of the data section to
> 100 bytes to match that of the packets from the linux machines.
> t_time needed to be padded to 64 bits.
> The structure of the sckaddr_in structure differed between XP and linux, so
> we adjusted it to reproduce a linux packet.
>
> Rob, The patch is not elegant, but it works for us. If you would like us to
> post the patch then let me know.
>
> Neil
>
> > Theo, have there been any changes to the broadcast data structure
> > in newer version of Backhand? If so the NT Backhand Broadcaster
> > code would need to be updated to include the changes.
> >
> > Other than that make sure your settings in the registry for NT
> > BHB are correct. It looks like the broadcast data structure
> > after the IP address is having a problem. This could be because
> > a required piece of data is missing in the registry or if the
> > backhand data structure changed, and the change was not
> > duplicated to NT BHB.
> >
> > Let's wait for a message from Theo confirming if there were /
> > were not changes to the broadcast data structure, and meanwhile
> > you can double check your settings. If neither of those two
> > yeild any results I can take a look at the NTBHB code -- it's
> > been a while...
> >
> > Later
> > Rob
> > >
> > > We have just set up NT Backhand Broadcaster on 4 XP machines
> > >
> > > We have two SuSE Linux machines running Apache 1.3.28 and
> > mod_backhand 1.2.2
> > > which are correctly working.
> > >
> > > When the status page is accessed (http://localhost/backhand/)
> > the stats that
> > > are returned from the 2 Linux machines are correct, but the
> > stats which are
> > > returned from the XP machines look garbled.
> > > The hostname and age appear correct.
> > > The IP address is correct but the port is listed as 0 not 80
> > > Total Mem is listed as 1MB; Avail Mem is listed as 1073201152 MB.
> > > Arriba is 0; #CPUs is 1000; Load/HWM is 0.000/0 and CPU Idle is 0.000
> > >
> > > Checking the registry settings on the XP machines everything
> > looks good -
> > > the Arriba score is 673266000.
> > >
> > >
> > > Backhanding is working between the two linux boxes but it never
> > goes to the
> > > XP machines. Instead an apache Internal Server Error is
> > received. Checking
> > > the apache error log an entry of "Request exceeding the limit
> > of internal
> > > redirects" is listed.
> > >
> > > Is this anything to do with the NT Backhand stats being garbled
> > - ie. a port
> > > of 0 meaning the server cannot proxy?
> > >
> > > Using HTTPRedirectByName works; HTTPRedirectByIP fails (I
> > assume again due
> > > to the port number)
>
>
> ________________________________________________________________________
> This e-mail has been scanned for all viruses by Star Internet. The
> service is powered by MessageLabs. For more information on a proactive
> anti-virus service working around the clock, around the globe, visit:
> http://www.star.net.uk
> ________________________________________________________________________
>
> _______________________________________________
> backhand-users mailing list
> backhand-users@lists.backhand.org
> http://lists.backhand.org/mailman/listinfo/backhand-users
>