Hi, the reason for your problem is clear from the firewall logs: the X11 Connection attempt is blocked by the firewall. The increasing source ports is just the normal behaviour of a program when it is trying to establish a connection over TCP. To get this to work you can either open port 6000 on your firewall (not such a good idea IMHO) or do 'ssh -X' if you are using openSSH, since openSSH has X11 forwarding disabled by default IIRC. Note that you may have to allow X11 forwarding in the ssh daemon configuration. And just a remark since you asked this on the security mailing list: from the security point of view you should never use rsh or rlogin for working on a remote server since the communication is unencrypted. Always use ssh! Hope this helps... Best wishes, Thomas On Wed, Sep 05, 2001 at 11:44:56AM +0200, kohli@dplanet.ch wrote:

Hi again. I already asked that question once, but then I didn't get any helpful answers... Following problem: I'm in the intranet at my office, and want to work on a remote server. Let's call him jasper. So, I'm on jasper an make a "xspread". Now I get the following answer: xspread: Can't open display client84.xxxx.xx:0

It doesn't matter whether I use ssh or rlogin or rsh to log in to jasper, it simply doesn't work.

My firewall log says: Sep 5 11:17:55 memphis kernel: Packet log: rulchain REJECT eth0 PROTO=6 xxx.xx.xxx.xx:60972 xxx.xx.xxx.xx:6000 L=44 S=0x00 I=5353 F=0x4000 T=255 SYN (#5) Sep 5 11:17:56 memphis kernel: Packet log: rulchain REJECT eth0 PROTO=6 xxx.xx.xxx.xx:60974 xxx.xx.xxx.xx:6000 L=44 S=0x00 I=5354 F=0x4000 T=255 SYN (#5) Sep 5 11:17:57 memphis kernel: Packet log: rulchain REJECT eth0 PROTO=6 1xxx.xx.xxx.xx:60975 xxx.xx.xxx.xx:6000 L=44 S=0x00 I=5355 F=0x4000 T=255 SYN (#5) Sep 5 11:17:58 memphis kernel: Packet log: rulchain REJECT eth0 PROTO=6 1xxx.xx.xxx.xx:60976 xxx.xx.xxx.xx:6000 L=44 S=0x00 I=5356 F=0x4000 T=255 SYN (#5) Sep 5 11:17:59 memphis kernel: Packet log: rulchain REJECT eth0 PROTO=6 xxx.xx.xxx.xx:60977 xxx.xx.xxx.xx:6000 L=44 S=0x00 I=5357 F=0x4000 T=255 SYN (#5)

Now, how can I solve that problem? Also, I wonder why the outgoing port on jasper is steadily inceasing by one, with each attempt to connect...?

Any help appreciated!

TIA

markus

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-- Thomas Haeberlen Rechenzentrum Universitaet Stuttgart (RUS) Abteilung Informationsdienste Allmandring 30 , D-70569 Stuttgart Email: haeberlen@rus.uni-stuttgart.de Phone: +49 711 685 47 19 Fax: +49 711 678 76 26