I'm unable to ssh from a particular machine, either from my Ubuntu 12.04 install or my Windows Vista install (using putty). I'm trying to ssh into a remote machine where I have an account, but I keep getting a "connection refused" error. However, from another computer in my office using the same setup, I can connect just fine

Here is the ouput of `dig sun.chpc.ac.za`:

```
; <<>> DiG 9.8.1-P1 <<>> sun.chpc.ac.za
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55409
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;sun.chpc.ac.za. IN A
;; ANSWER SECTION:
sun.chpc.ac.za. 2598 IN A 196.24.44.62
;; Query time: 1 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Oct 30 21:40:35 2012
;; MSG SIZE rcvd: 48
"nslookup sun.chpc.ac.za" Server: 127.0.0.1 Address: 127.0.0.1#53
Non-authoritative answer: Name: sun.chpc.ac.za Address: 196.24.44.62

```

I stopped the Firewire and tried to ssh, but it still said "connection refused"

When I run `nmap sun.chpc.ac.za`:

```
Starting Nmap 5.21 ( http://nmap.org ) at 2012-10-30 22:24 SAST 
Nmap scan report for sun.chpc.ac.za (196.24.44.62) 
Host is up (0.0044s latency). 
Not shown: 998 closed ports 
PORT STATE SERVICE 
1863/tcp filtered msnp 
2000/tcp filtered cisco-sccp
Nmap done: 1 IP address (1 host up) scanned in 2.81 seconds

```

Here is the output of the coommand: `ssh -vvv user@sun.chpc.ac.za`

```
OpenSSH_5.9p1 Debian-5ubuntu1, 
OpenSSL 1.0.1 14 Mar 2012
debug1: Reading configuration data /etc/ssh/ssh_config 
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to sun.chpc.ac.za [196.24.44.62] port 22.
debug1: connect to address 196.24.44.62 port 22: Connection refused
ssh: connect to host sun.chpc.ac.za port 22: Connection refused

```

Here is the `ipconfig` output of the Windows computer that can connect:

```
Windows IP Configuration

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . :
   Link-local IPv6 Address . . . . . : fe80::f988:68a0:c432:d37c%11
   IPv4 Address. . . . . . . . . . . : 172.20.15.51
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 172.20.15.254

Tunnel adapter Teredo Tunneling Pseudo-Interface:
   Connection-specific DNS Suffix  . :
   IPv6 Address. . . . . . . . . . . : 2001:0:5ef5:79fb:3403:122f:53eb:f0cc
   Link-local IPv6 Address . . . . . : fe80::3403:122f:53eb:f0cc%12
   Default Gateway . . . . . . . . . : ::

Tunnel adapter isatap.{C3E90CF9-5991-4463-AC91-A1497807E5D6}:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

```

Using the same cable, here is the `ifconfig` output of my Linux laptop that can not connect:

```
eth0      Link encap:Ethernet  HWaddr 00:14:0b:3f:b9:4c  
      UP BROADCAST MULTICAST  MTU:1500  Metric:1
      RX packets:135737 errors:0 dropped:0 overruns:0 frame:0
      TX packets:111352 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000 
      RX bytes:155954649 (155.9 MB)  TX bytes:10990034 (10.9 MB)
      Interrupt:17 

lo        Link encap:Local Loopback  
      inet addr:127.0.0.1  Mask:255.0.0.0
      inet6 addr: ::1/128 Scope:Host
      UP LOOPBACK RUNNING  MTU:16436  Metric:1
      RX packets:25939 errors:0 dropped:0 overruns:0 frame:0
      TX packets:25939 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:0 
      RX bytes:2034277 (2.0 MB)  TX bytes:2034277 (2.0 MB)

wlan0     Link encap:Ethernet  HWaddr 00:13:e8:f8:0e:af  
      inet addr:172.1.2.33  Bcast:172.1.255.255  Mask:255.255.0.0
      inet6 addr: fe80::213:e8ff:fef8:eaf/64 Scope:Link
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:1885246 errors:0 dropped:0 overruns:0 frame:0
      TX packets:196008 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000 
      RX bytes:430638332 (430.6 MB)  TX bytes:36583180 (36.5 MB)

```

The output of `tcptraceroute sun.chpc.ac.za 22` is:

```
Selected device eth0, address 172.20.15.35, port 51859 for outgoing packets

Tracing the path to sun.chpc.ac.za (196.24.44.62) on TCP port 22 (ssh), 30 hops max

 1  172.20.15.254  0.494 ms  0.431 ms  0.354 ms
 2  * * *
 3  196.24.44.62 [closed]  0.323 ms  0.326 ms  0.312 ms

```