The FTP Publisher always sets a build to Unstable because it can't read the file. Jenkins has all rights to write and read the files from ftp.

file:/var/lib/jenkins/jobs/ConnectivityGateway_WeeklyBuilds/workspace/
current root dir /upload/jenkins
current root dir /upload/jenkins/cgw/weekly
ERROR: Failed to upload files
java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:146)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
at java.io.BufferedInputStream.read(BufferedInputStream.java:254)
at java.io.FilterInputStream.read(FilterInputStream.java:83)
at java.io.PushbackInputStream.read(PushbackInputStream.java:139)
at org.apache.commons.net.io.FromNetASCIIInputStream.__read(FromNetASCIIInputStream.java:75)
at org.apache.commons.net.io.FromNetASCIIInputStream.read(FromNetASCIIInputStream.java:170)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
at java.io.BufferedInputStream.read(BufferedInputStream.java:254)
at org.apache.commons.net.telnet.TelnetInputStream.__read(TelnetInputStream.java:114)
at org.apache.commons.net.telnet.TelnetInputStream.run(TelnetInputStream.java:535)
at java.lang.Thread.run(Thread.java:679)
Build step 'Publish artifacts to FTP' changed build result to UNSTABLE