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I have a network running here on a Ubuntu server. A DHCP and a DNS server are running. I now have one Windows computer in that network and several computers with Ubuntu installed. I can ping and have access to its shared hard drives with some Ubuntu computers. However with two of the computers (including the server) I cannot connect to the Windows computer.

If I do an nmap I can't find it. And I can't ping it.

As I did an arp -a -n I could find it but that doesn't help me.

Looking forward to your help and sorry for my bad English.

EDIT:nmap -sn 192.168.2.0/24 did not work sudo nmap 192.168.2.0/24 gave me 

Nmap scan report for 192.168.2.21

Host is up (0.0018s latency).
Not shown: 987 filtered ports
PORT      STATE  SERVICE
16992/tcp closed amt-soap-http
49157/tcp open   unknown
49158/tcp open   unknown
49159/tcp closed unknown
49163/tcp closed unknown
50000/tcp closed ibm-db2
50300/tcp closed unknown
50636/tcp closed unknown
50800/tcp closed unknown
54328/tcp closed unknown
56738/tcp closed unknown
58080/tcp closed unknown
61900/tcp closed unknown
MAC Address: ***
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  • Have you installed winbind?
    – Ken Sharp
    Apr 13, 2015 at 17:09
  • i can't see the reason for this because on some computers its actually working fine using the shared drives
    – m0rtuu
    Apr 14, 2015 at 12:50
  • The accepted answer indicates the problem is not related to Ubuntu. The problem was caused by incorrect setup of ZoneAlarm in the Windows PC. This question should be closed.
    – user68186
    May 13, 2015 at 15:09
  • how to close or delete this question because its obviously not necessary
    – m0rtuu
    May 13, 2015 at 19:08
  • @m0rtuu: don't do anything... The question is being closed as "off topic"...
    – Fabby
    May 14, 2015 at 21:46

1 Answer 1

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Actually the custom firewall ZoneAlarm on the Windows-PC was blocking everything

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