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Unable to transfer an image file greater than 32 MB using the TFTP server and user receives the "TFTP: error code 0 received - Undefined error code and %Error writing tftp:" error messages in a Catalyst 6500 Switch running IOS

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Core issue

The issue happens when the image size is greater than 33554432 bytes and the image transfer is done from the device to the TFTP server and vice-versa.

In some scenarios, you may also get the file too large for TFTP protocol error message while performing a file transfer.

This problem occurs due to a software bug which is identified in Cisco bug ID CSCee67733.

Resolution

The workaround is to follow either one of these two procedures:

  • Use FTP server functionality instead of TFTP or you can use the TFTPD32 utility which is a third party utility.
  • Upgrade to Cisco IOS® Software Release 12.2(17d)SXB07 or later which can be downloaded from the LAN Switching Software page.

For problems related to a software image transfer from a TFTP server failure or timeout, refer to the article Software image transfer from a TFTP server fails or timeout.

For additional information, refer to TFTP Server Selection and Use.

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