In Jenkins test project i have in Execute shell:

dd if=/dev/urandom of=ios_512MB bs=531628032 count=1

and i have checked and configured Send files or execute commands over SSH after the build runs

When i run it i see:

Started by user X
Building remotely on ios in workspace /data/workspace/test
[test] $ /bin/sh -xe /var/folders/9b/s86tztx90bb9c_73gtynfzx80000gn/T/hudson8582983867531973712.sh
+ dd if=/dev/urandom of=ios_512MB bs=531628032 count=1

1+0 records in
1+0 records out
531628032 bytes transferred in 44.384345 secs (11977828 bytes/sec)
SSH: Connecting from host [jenkins2.local]
SSH: Connecting with configuration [jenkins.builds] ...

I see on Network traffic this connection, and its stops. On sftp i have:

ls -lh
rw------ 1 10048 10047 130M Apr 16 09:56 ios_512MB

On windows/ubuntu all works well. How to fix it?