FTPS access over WAN?

First comparing the logs proftpd.log and tls.log for differences when logging in an out with FTPS over LAN resp WAN.

FTPS over LAN - proftpd.log

# tail -f /var/log/proftpd.log
Jan 28 15:33:01 duo proftpd[29900] 10.0.1.160 (10.0.1.15[10.0.1.15]): FTP session opened.
Jan 28 14:33:05 duo proftpd[29900] 10.0.1.160 (10.0.1.15[10.0.1.15]): Preparing to chroot to directory '/home/ftp'
Jan 28 14:33:05 duo proftpd[29900] 10.0.1.160 (10.0.1.15[10.0.1.15]): USER bob: Login successful.
Jan 28 14:33:14 duo proftpd[29900] 10.0.1.160 (10.0.1.15[10.0.1.15]): FTP session closed.

FTPS over LAN - tls.log

# tail -f /var/ftpd/tls.log
Jan 28 15:33:01 mod_tls/2.4.2[29900]: using default OpenSSL verification locations (see $SSL_CERT_DIR environment variable)
Jan 28 15:33:01 mod_tls/2.4.2[29900]: TLS/TLS-C requested, starting TLS handshake
Jan 28 15:33:02 mod_tls/2.4.2[29900]: TLSv1/SSLv3 connection accepted, using cipher AES128-SHA (128 bits)
Jan 28 15:33:04 mod_tls/2.4.2[29900]: Protection set to Private
Jan 28 14:33:06 mod_tls/2.4.2[29900]: starting TLS negotiation on data connection
Jan 28 14:33:06 mod_tls/2.4.2[29900]: TLSv1/SSLv3 renegotiation accepted, using cipher AES128-SHA (128 bits)
Jan 28 14:33:06 mod_tls/2.4.2[29900]: TLSv1/SSLv3 data connection accepted, using cipher AES128-SHA (128 bits)

Everything works fine. But notice the differnces in time, the hour should be 14 for all events.
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Ok let's move on to connecting over WAN.

FTPS over WAN - proftpd.log

# tail -f /var/log/proftpd.log
Jan 28 15:45:19 duo proftpd[29939] 10.0.1.160 (119.78.39.30[119.78.39.30]): FTP session opened.
Jan 28 15:45:20 duo proftpd[29939] 10.0.1.160 (119.78.39.30[119.78.39.30]): FTP session closed.

Result: The connection could not be established.

FTPS over WAN - tls.log

# tail -f /var/ftpd/tls.log
Jan 28 15:45:19 mod_tls/2.4.2[29939]: using default OpenSSL verification locations (see $SSL_CERT_DIR environment variable)
Jan 28 15:45:20 mod_tls/2.4.2[29939]: TLS/TLS-C requested, starting TLS handshake
Jan 28 15:45:20 mod_tls/2.4.2[29939]: unable to accept TLS connection: received EOF that violates protocol
Jan 28 15:45:20 mod_tls/2.4.2[29939]: TLS/TLS-C negotiation failed on control channel

Result: The connection could not be established.