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Old 10-21-2007, 03:59 PM   #1
Registered: Apr 2007
Posts: 31

Rep: Reputation: 15
ubuntu 7.10 aft upgrade f/7.04 , rdesktop, ssh, refuse connections

After an upgrade from 7.04 to 7.10 ubuntu, both my remote desktop and ssh connections are refused. Any thoughts?

netstat shows the same thing in both 7.04 and 7.10 (I have a clone of 7.04 on a second drive so I can go back to before the upgrade) on 7.04 it all works just fine.

(BTW, is this really using ip version 6, is that what tcp6 means?, I don't know version 6 at all, so I'm confused)

tcp6  0 0 :::5900    :::*  LISTEN
tcp6  0 0 :::22      :::*  LISTEN
Using ethereal, I can see an ICMP packet comming back from ubuntu to the system trying to connect, which is pretty much saying the port number 22 is unreachable. I get the same with rdesktop and port 5900.

Here's a dump, of an attempt to connect via ssh:

Internet Control Message Protocol
    Type: 3 (Destination unreachable)
    Code: 3 (Port unreachable)
    Checksum: 0x813b (correct)
    Internet Protocol, Src Addr: (, Dst Addr: (
        Version: 4
        Header length: 20 bytes
        Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
            0000 00.. = Differentiated Services Codepoint: Default (0x00)
            .... ..0. = ECN-Capable Transport (ECT): 0
            .... ...0 = ECN-CE: 0
        Total Length: 48
        Identification: 0x33ac
        Flags: 0x04
            .1.. = Don't fragment: Set
            ..0. = More fragments: Not set
        Fragment offset: 0
        Time to live: 128
        Protocol: TCP (0x06)
        Header checksum: 0x4300 (correct)
        Source: (
        Destination: (
    Transmission Control Protocol, Src Port: 4157 (4157), Dst Port: 22 (22), Seq: 3603485568, Ack: 0, Len: 0
        Source port: 4157 (4157)
        Destination port: 22 (22)
        Sequence number: 3603485568
        Header length: 28 bytes
        Flags: 0x0002 (SYN)
            0... .... = Congestion Window Reduced (CWR): Not set
            .0.. .... = ECN-Echo: Not set
            ..0. .... = Urgent: Not set
            ...0 .... = Acknowledgment: Not set
            .... 0... = Push: Not set
            .... .0.. = Reset: Not set
            .... ..1. = Syn: Set
            .... ...0 = Fin: Not set
        Window size: 16384
        Checksum: 0x052f (correct)
        Options: (8 bytes)
            Maximum segment size: 1260 bytes
            SACK permitted
Old 10-21-2007, 06:46 PM   #2
Registered: Apr 2007
Posts: 31

Original Poster
Rep: Reputation: 15
Ok, it was the firewall

I had to turn off the firewall to get them to work again.

Firestarter was handy, one button to turn it off.


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