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I tried download file via TFTP on Ubuntu 16.04LTS machine from TFTP server (TFTPD32) running on Windows 7 machine. On Ubuntu every time I got error Transfer timed out. On Windows 7 PC Windows firewall is configured to allow tftp traffic, but I also tried with firewall completely disabled, and Anti-virus software disabled - same result. Different internet connection (different ISP) on Ubuntu and Windows computer. Below is tftp output on Ubuntu and Tftpd32 log on Windows:

tftp> get test.bin
getting from 63.231.242.57:test.bin to test.bin [octet]
Transfer timed out.

Tftpd32 log on Windows PC:

Connection received from 213.173.91.204 on port 48859 [12/10 23:45:17.697]
Read request for file <test.bin>. Mode octet [12/10 23:45:17.697]
Using local port 62693 [12/10 23:45:17.697]
WARNING : Last block #1 not acked for file <test.bin> [12/10 23:45:47.228]
<test.bin>: sent 0 blk, 0 bytes in 48 s. 6 blks resent [12/10 23:45:47.228]
WARNING : Last block #1 not acked for file <test.bin> [12/10 23:45:50.832]
<test.bin>: sent 0 blk, 0 bytes in 48 s. 6 blks resent [12/10 23:45:50.832]
WARNING : Last block #1 not acked for file <test.bin> [12/10 23:45:55.777]
<test.bin>: sent 0 blk, 0 bytes in 48 s. 6 blks resent [12/10 23:45:55.777]
WARNING : Last block #1 not acked for file <test.bin> [12/10 23:46:00.862]
<test.bin>: sent 0 blk, 0 bytes in 48 s. 6 blks resent [12/10 23:46:00.862]

Please advice what is the issue here?