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Cisco Bug: CSCus35747 - TFTP tries to send response on closed connections

Last Modified

Aug 08, 2016

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

10.0(1.10000.24) 10.5(1.10000.7) 10.5(2.10000.5) 8.6(2.10000.30) 9.1(2.10000.28)

Description (partial)

In a Proxy TFTP configuration, while the TFTP proxy server is fetching files from a remote CUCM TFTP server, TFTP may close the connection to the phone before the file was received. This is expected behavior.

However, when the file is received from the remote CUCM TFTP server, the Proxy TFTP server will attempt to send a response to the phone via the closed connection. This is a problem behavior.

TFTP Proxy configuration, where delays in fetching remote files may be >1 second.
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