I had a same scenario just an

[registrations]

I ran into same scenario with isr 4321 tftp is working no windows firewall on server. I can ping the router from laptop and from router . I tried following command.

Router(config)#ip tftp source-interface gig0/0/1

where the int gig0/0/1 is where my server subnet is learning in ip routing tables

[PrescottValley]

This fixed my problem.

ip tftp source-interface gig0/0/0

[PrescottValley]

Interface laptop was connected to.

[Gino Huaman]

Hi Michael,

I spent more than 4 hours. Finally, I put the source and it worked.

Thanks a lot!

[ghalbedel]

That worked. Thank you so much!

[comprev]

>>>>Router(config)#ip tftp source-interface gig0/0/0
where the int gig0/0/0 is where my laptop is directly connected.<<<<<

From the testing I've done, the point to the command is to give the TFTP transfer a source address. I've used a loopback for the interface and it still works. It didn't have to be the interface where my TFTP server is connected.

[MUN_KP]

Oh - its really grate. I have facing same problem also - right now its working properly. 

[allie ahmed]

That command certainly did- Tnx

[g3diss]

We were experiencing this issue on a new VG450 .Worked straight away! Thank you...

[RamónR]

This command was very useful, you save me!!

[aljubouri1983]

That was it. thank you! 

[jpino]

I have same problem. When I made a capture I could see the problem, Cisco uses port 21 for connection and not 69 as the answer.When entering the configuration "ip tftp source-interface gig0/0/0",the gateway made the connection to the correct port. This looks like an ISR BUG

[Heath Mulder]

Does FTP not use port 21 and TFTP use port 69 ? 

For so far i have seen many Cisco routers and switches need that command to specify the port on where you want to do the TFTP download , i do not think that is caused by a bug. 

For example Nexus switches or Catalyst 4900M and ASR1001-X and some newer ISR43xx (Generation3) routers require this command.  Aliter networks tests all ports and we use this command requirement on many different types of equipment .  

For example here you will find a example config for a 4500 supervisor engine also forced to configure the management vrf in order to copy a backup startup-configuration file on the management interface fastethernet1 :

Switch#
Switch#config t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#
Switch(config)#
Switch(config)#interface f1
Switch(config-if)#ip vrf forwarding mgmtVrf
Switch(config-if)#ip addr 10.0.1.20 255.255.255.0
Switch(config-if)#speed auto
Switch(config-if)#duplex auto
Switch(config-if)#end
Switch#
Switch#
*Aug 14 07:54:43.611: %SYS-5-CONFIG_I: Configured from console by console
Switch#ping vrf mgmtVrf 10.0.1.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.1.1, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 1/2/4 ms
Switch#
Switch#
Switch#config t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#
Switch(config)#ip tftp source-interface FastEthernet1
Switch(config)#exit
Switch#

[fazil124]

Thank you Sir. It helped! :)) 

[brucejohnson]

Command worked perfect....thanks