It seems that I have a problem with the fcgid configs. If I switch to FPM application served by apache or nginx I am able to upload 1GB files without any errors. If I switch to fcgid then I get again these errors.
Sometimes additional:
Hello Forum,
I am switching to a new server because need more webspace. Things which have been worked on old server are not working anymore.
Old Server:
Plesk Version 17.5.3
Ubuntu 14.04.6 LTS
Nginx Apache FastCGI
PHP 5.3.29
New Server:
Plesk Version 17.8.11
Ubuntu 16.04.6 LTS
Nginx...