The first step would be to enable debugging:
a. Use the CatTools File menu to select the "Enable capture mode" option.
b. Run the activity you are having trouble with. This should create a debug file in the \CatTools3\Debug folder.
c. Zip up the resulting file and send this to me as an attachment.
d. Remember to deselect the "enable capture mode" option again.
This will show you communication between CatTools and the device.
Thanks for the swift response.
In the debug files i see the same error for all failing switches:
%Error opening tftp://<kiwi IP address>/<device_name>.txt (Timed out)
However, there are no accesslists in place.
I will continue troubleshooting myself why the abroad switch can't contact the TFTP server, and keep you posted on the outcome.
The debug information from the "Enable capture mode" gave me a good starting point, thanks!
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After some troubleshooting I found out that the TFTP session on the switch was not initiated from the vlan1-interface (as I expected), but from a different interface, which was not included in the site to site VPN tunnel.
After sending all affected switches the command
IP TFTP Source-Interface vlan1
everything works fine.