C3850-TFTP Error

[afathi1992]

I'm trying to copy IOS image for C3850 switch by TFTP 

%Error opening tftp://A.B.C.D/cat3k_caa-universalk9.16.12.13.SPA.bin (Timed out)

[balaji.bandi]

First check is the TFTP Server reachable 

try copy running config to TFTP is this works

Check the path is correct and File available in the root folder.

check Windows any Firewall which blocking 

Do you have source interface configured - ip tftp source-interface x/x

if above both works, try below solution from my blog :

check this may be helpful :

https://www.balajibandi.com/?p=1713

[Leo Laohoo]

conf t
ip tftp source-interface <VLAN>
end

[MHM Cisco World]

debug tftp events <<- share this 

MHM

[Richard Burts]

BB has already made most of the suggestions I would have made,  I will add to his suggestion about checking for connectivity:

- look carefully through your configuration for any entry about tftp (especially tftp source-interface). 

- attempt to ping the server (if tftp specified a source interface then be sure to use that as the source of the ping).

- if ping was successful then look for issues he mentions such as acl, etc.