Hello,
I have a Red Hat 8 installed machine. Very often I used to transfer a bin to another machine in the same network using ftp. I will login as "root" to that machine. The issue is after the file transfer the bin file's executable permission is gone. Every time I have to do
chmod +x <bin-file> to make it executable. Why the executable permission is not retained? Can anyone explain me? Thanks.

What is your ftp server? If it's not vstfp, then install it, and edit /etc/vsftpd.conf. All is explained here.

I have vsftpd-1.1.3-8 installed in my machine.

After some study I found out that file_open_mode numeric option does the default permission setting for uploaded files. I added this option inside my vsftpd.conf file. The man vsftpd.conf page says....

file_open_mode
The permissions with which uploaded files are created. Umasks are applied on top of this value. You may wish to change to 0777 if you want uploaded files to be executable.

Default: 0666

I edited the vsftpd.conf file, added this option with file_open_mode=0777 and restarted the vsftpd service. I have a file doclean.sh with permission 0700 in my home directory.

[seran@seran seran]$ ls -tl doclean.sh
-rwx------ 1 seran ico 417 Jul 13 14:59 doclean.sh

Then I did a file transfer, the umask value in the destination machine was 0022.

[root@pluto root]# umask
0022

But the file permissions were......

[root@pluto root]# ls -tl doclean.sh
-rw-r--r-- 1 root root 417 Jul 13 18:06 doclean.sh

So default file permission 0666 was applied, and after umask it became 0644. The option file_open_mode=0777 didnt had any affect on the file transfer.

Did I missed anything here?