TFTP Host Error: Access violation

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TFTP Host Error: Access violation

Hi guys,

I am pretty new in this forum.
I've been using MACBOOK and MAC OS X since middle 2009.
I am using the host tftp server to upload files into my embedded boards.
This time i upgraded do Snow Leopard and tftp does not work anymore.
I always have the following message: Host Error: Access violation.

I tried many thing but i can not solve this puzzle.
The following is what i tried:

1) chmod 777 all the folder and files;
2) Allow all users to conect the TFTP folder (in System Preferences);
3) Firewall is on now, but even with firewall off I have the same problem;
3) I tried to check the file tftp.plist (System/Library/LaunchDaemons) and i noticed two major differences: a) It was written DISABLED and b) the flag was for secure -s. Well i root and changed the file with ENABLED and -i insecure, but nothing changed. The strange thing also is that after i star the computer the back to its normal like the changes i made weren't saved, but i was root and they saved.

I am also using the TFTP Server 3.3.1 from Mr Fabrizio Larosa. Permissions and other stuff are ok when using this software.

Am i forgetting something special?
Can somebody help me? I do not know what to do anymore.

Thanks volks.

MacBook Pro 17", Mac OS X (10.6.2)

Posted on Jan 21, 2010 2:17 PM

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Answer 1

Camelot

Level 9

58,581 points

Jan 21, 2010 3:50 PM in response to N@ndO

There are some inconsistencies in your post...

2) Allow all users to conect the TFTP folder (in System Preferences);

There is no TFTP option in System Preferences, so I'm not sure what you're seeing... FTP, maybe?

Well i root and changed the file with ENABLED and -i insecure

There is no enabled tag in launchd. Processes are inherently enabled unless they have the <disabled> tag. The right way to enable a process is to remove the disabled tag (and the corresponding <true/> tag, or use launchctl.
I don't know if the presence of the illegal enabled key is having any effect or not.

I am also using the TFTP Server 3.3.1 from Mr Fabrizio Larosa

What's wrong with the built-in TFTP server? That's the one that launchd is configured to start/stop. There's no guarantee that tftp.plist will work with another TFTP server, so the changes you make there might not be relevant anyway.

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Answer 2

N@ndO Author

Level 1

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Jan 21, 2010 4:46 PM in response to N@ndO

Yes i know that there is no TFTP in System Preferences:
What i meant is that I configured the sharing permissions in System Preferences for the TFTP folder i am using. For example, my folder is: /Volumes/Ncb002 D/00_TFTPbootFiles. Fro that i used the System Preferences and added the folder.

Ok i understand that, so how can assure i can have my TFTPserver Enabled using launchctl and how can i change it from secure to insecure? More than that i am loosing my hair, i need the TFTP working. Without that i can not transfer files to my embedded board.

Last version was working. I was using Leopard and everything was ok, the TFTP was working. After i changed to Snow Leopard i can not do anything without a Host access error.

So i compared the 2 tftp.plist files, Leopard working and Snow Leopard not working. As i wrote the major differences are: ENABLED tag in first line and -s tag (secure mode) in tftp.plist for Snow Leopard. In Leopard the tftp.plist has no ENABLE tag and it is by default -i (insecure).

I really do not know if that is the reason, i just do not know what to do to get this to work.

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Answer 3

N@ndO Author

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Jan 21, 2010 4:49 PM in response to N@ndO

Sorry correcting the paragraph:

So i compared the 2 tftp.plist files, Leopard working and Snow Leopard not working. As i wrote the major differences are: DISABLED tag in first line and -s tag (secure mode) in tftp.plist for Snow Leopard. In Leopard the tftp.plist has no DISABLED tag and it is by default -i (insecure).

Please use this paragraph.

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Answer 4

Camelot

Level 9

58,581 points

Jan 21, 2010 6:05 PM in response to N@ndO

What i meant is that I configured the sharing permissions in System Preferences for the TFTP folder i am using

That has no relevance. The sharing preferences only relate to AFP, NFS, SMB and FTP sharing, and have no effect on TFTP.

TFTP has no concept of authentication - if the file is there, anyone can read it. As such ownership of the file is important - you need to make sure the directory and all its files are world-readable (and world-writable if you want clients to save to the TFTP server).

I would suspect this is the root of your problem, although it isn't yet clear if tftpd is actually running or not.

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Answer 5

N@ndO Author

Level 1

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Jan 22, 2010 10:28 AM in response to Camelot

Ok, i am pretty new, so thank you for explanations.

So, what is sufficient to have the directory and all its files world-readable and writable?

A chmod 777 solves that? As i told I alread made.

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Answer 6

N@ndO Author

Level 1

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Jan 31, 2010 7:34 PM in response to N@ndO

Everything is working now.
I just set all the rights of the files to world writable and readable.

I also make sure my TFTP was working because in tftp.plist a DISABLE </true> tag was in the beginning of the file. I deleted myself this tag.

After that all worked and that may be the problem.

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Answer 7

Feb 1, 2010 3:08 AM in response to N@ndO

I use tftp all the time to configure Cisco routers.

I left the disabled tag in my config. When I need to use tftp I switch it on with:

sudo launchctl load -F /System/Library/LaunchDaemons/tftp.plist

I suspect the problem you might have been experiencing was a permission issue.

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