Horde login failed on linux plesk

while logging to webmail got an error “Horde login failed” , had tried to reset the password of the email address but that did not fix the issue. After further investigating what I found is that I was unable to telnet the IMAP port – the command used for this is:

root# telnet localhost 143

Then, checked with ifconfig and got the output:

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x4
inet6 ::1 prefixlen 128

The line “inet 127.0.0.1 netmask 0xff000000” was missing, to get this fixed I executed the below command:

root# ifconfig lo0 127.0.0.1 netmask 255.0.0.0

Then, I have tried to login using Horde and it worked perfectly fine.