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Windows Deployement Services TFTP File Limit

Posted on 2014-01-23
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Last Modified: 2016-11-23
I am currently using TFTP32D to TFTP configuration files to a Dell powerconnect switch using the switch command (while the TFTP32D server is running)...

copy tftp://xxx.xx.xx.xxx/configuration.cfg running-config

This command works and the configuration is uploaded successfully. However I would prefer not to use TFTP32D as my TFTP server and would like to use the TFTP functionality provided by WDS (Windows Deployment Services) - I know this isnt strictly the role of this service but it seems as though it could be reused for my purposes...

I have managed to get this working as follows...

1. Closing any other TFTP servers running on machine e.g. TFTP32D
2. Starting the 'Windows Deployment Services' service.
3. Adding the Dell configuration file to the WDS TFTP root.
4. Running the switch command (as above).

The above works - but heres the problem...

The WDS TFTP service will only allow me to transfer files < 512 bytes in size. This proves that server/switch connectivity works and the idea in principal is OK. However if I transfer any file larger than 512 bytes (which they all will be) the transfer fails (using exactly the same file works with TFTP32D so that isnt the problem from the switch perspective).

On the switch when I transfer a large config file with TFTP32D I get the message...

    TFTP Configuration Script Transfer Starting

    1875 bytes transferred

    File Transfer Complete

On the switch when I transfer a large config file with WDS TFTP I get the message...

    TFTP Configuration Script Transfer Starting

    512 bytes transferred

    File Transfer Failed!

So the question is to any (WDS/TFTP) gurus out there, how can I configure WDS TFTP to transfer files > 512 bytes in size. I am sure WDS handles larger files when deploying operating systems etc.
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Question by:Blowfelt82
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Accepted Solution

by:
Felix Leven earned 500 total points
ID: 39802702
Changed in SP1

Regedit:
MaximumBlockSize
This value has the following properties:

Location:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\WDSServer\Providers\WDSTFTP

Without SP1 you Need a Howfix to make the Registry Key work:

"Operating system deployment over a network by using WDS fails in Windows Server 2008 and in Windows Server 2008 R2"
http://support.microsoft.com/kb/975710/en-us
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Expert Comment

by:Felix Leven
ID: 39826026
Hi Blowfelt82, should be working now, right ?
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