ERROR [org.alfresco.fileserver] [AlfJLANWorker18] Error from JLAN

Hi all,

I'm trying to get CIFS to work with Alfresco Community Edition 201602 GA Release (binary installation) on a VirtualBox Machine with Linux Mint 17.3 KDE. This machine is like the rest of my machines in my LAN behind a router in domain "lan" and I want to access Alfresco from them.
But I see no Alfresco CIFS Share and I cannot connect to it with smbclient. I can see other Samba shares from other devices within my LAN without a problem. Alfresco FTP share works although only for admin.

Now in catalina.out I see multiple errors like this:

ERROR [org.alfresco.fileserver] [AlfJLANWorker18] Error from JLAN org.alfresco.jlan.netbios.NetBIOSException: NBREQ Invalid packet len=194 at org.alfresco.jlan.smb.server.SMBSrvSession.procNetBIOSSessionRequest(SMBSrvSession.java:823) at org.alfresco.jlan.smb.server.SMBSrvSession.processPacket(SMBSrvSession.java:1469) at org.alfresco.jlan.smb.server.nio.NIOCIFSThreadRequest.runRequest(NIOCIFSThreadRequest.java:149) at org.alfresco.jlan.server.thread.ThreadRequestPool$ThreadWorker.run(ThreadRequestPool.java:153) at java.lang.Thread.run(Thread.java:745)

I have tried many things in alfresco-global.properties without success. At the moment it looks like this:

### CIFS Configuration ### cifs.enabled=true cifs.localname=AlfrescoA cifs.domain=lan cifs.broadcast=0.0.0.0 cifs.bindto=10.19.75.21 cifs.ipv6=disabled cifs.hostannounce=true

cifs.tcpipSMB.port=1445
cifs.netBIOSSMB.sessionPort=1139
cifs.netBIOSSMB.namePort=1137
cifs.netBIOSSMB.datagramPort=1138
cifs.WINS.autoDetectEnabled=true
cifs.sessionDebug=true

My hosts file looks like this:
127.0.0.1 localhost LinuxMintRosaVM.lan LinuxMintRosaVM AlfrescoA.lan AlfrescoA
127.0.1.1 LinuxMintRosaVM LinuxMintRosaVM.lan LinuxMintRosaVM AlfrescoA.lan AlfrescoA
10.19.75.21 LinuxMintRosaVM LinuxMintRosaVM.lan LinuxMintRosaVM AlfrescoA.lan AlfrescoA

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

My hostname is:
LinuxMintRosaVM

In my firewall I have allowed all incoming from 10.19.75.0/24 to 10.19.75.21 for any port and any interface. I also have deactivated ipv6 since I was seeing tcp6 with netstat.

I have also attached today's logs as well as netstat output.

Thanks in advance!