MyTrueHost 
Posted in 
Unable to update the main (default) FTP account password via control panel. The following error occurred:
Attempting to modify nonexistent username
Couldn't delete previous ProFTPd user config file.
OR
Unable to update the main FTP user password.
The issue is occurring due to the absence of password entry in the passwd.vhosts file.
#cd /etc/proftpd/
Server:/etc/proftpd#grep userName: passwd.vhosts
Server:/etc/proftpd#
This shows that password entry is missing in the /etc/proftpd/passwd.vhosts. Add the corresponding entry from /etc/proftpd/userName.
The entry can be found from /etc/proftpd/userName.
Server:/etc/proftpd#grep userName: userName
(example:- userName:$1$MAwZd0to$A8U6GQNGwkC0c7DA0P/7..:1697:1697:domainName:/home/userName:/nonexistent)
(example:- userName:$1$MAwZd0to$A8U6GQNGwkC0c7DA0P/7..:1697:1697:domainName:/home/userName:/nonexistent)
Add the above entry in /etc/proftpd/passwd.vhosts.
Server:/etc/proftpd#cat >> passwd.vhosts
userName:$1$MAwZd0to$A8U6GQNGwkC0c7DA0P/7..:1697:1697:userName:/home/userName:/nonexiste
This will fix the issue.
Note: Replace the userName, domainName by corresponding values. Also make sure that you are using “>>” instead of “>”. The “cat > passwd.vhosts” will wipe out the entire content in the passwd.vhosts file.
This is applicable to Cpanel, vDeck control panels.
