SCP stuck on file copying

I have a test file with a simple text inside. If filesize more then 750 bytes I can not transfer it via SCP or rsync.

Internet works fine on the host and has Download: 16.53 Mbit/s Upload: 2.83 Mbit/s

-rw-rw-r-- 1 4395 Nov 4 18:34 test scp -v test deployer@vpn-test_host:/home/deployer
debug1: Sending command: scp -v -t /home/deployer
Sending file modes: C0664 4395 test
Sink: C0664 4395 test
test 0% 0 0.0KB/s --:-- ETA

Ubuntu 18.04 is installed on both sides. How can I resolve this issue?

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