lwIP_AVR32_UC3 tftp port unreachable

I tried to use BasicTFTP.c & BasicTFTP.h from lwIP_AVR32_UC3 demo. Tere is ping of host. But when i try to get or put file via tftp i have acmp-back message Type 3:  Destination unreachable, Code 3: port unreachable.

Could someone help me? Where a problem may be ?


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