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Cannot telnet to PPMAC host
#1
Hi,

I am unable to telnet into my PPMAC host -- I get a connection refused error. PPMAC board is set to default IP address of 192.168.0.200. I can reach it via ping, so I am confused as to what is wrong. Please see output below. I am running under linux from the command line. The IP addtress of the linux host is 192.168.0.100 and I have a direct connection using a crossover cable to the PPMAC board. The connection refused response comes back immediately, there is no delay. Any help you can give me is appreciated.

Thanks,

Erik

[erikj@laplace erikj]$ ping -c 5 192.168.0.200
PING 192.168.0.200 (192.168.0.200) 56(84) bytes of data.
64 bytes from 192.168.0.200: icmp_seq=1 ttl=64 time=0.074 ms
64 bytes from 192.168.0.200: icmp_seq=2 ttl=64 time=0.087 ms
64 bytes from 192.168.0.200: icmp_seq=3 ttl=64 time=0.069 ms
64 bytes from 192.168.0.200: icmp_seq=4 ttl=64 time=0.050 ms
64 bytes from 192.168.0.200: icmp_seq=5 ttl=64 time=0.080 ms

--- 192.168.0.200 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4000ms
rtt min/avg/max/mdev = 0.050/0.072/0.087/0.012 ms
[erikj@laplace erikj]$ telnet 192.168.0.200
Trying 192.168.0.200...
telnet: connect to address 192.168.0.200: Connection refused
telnet: Unable to connect to remote host: Connection refused
[erikj@laplace erikj]$
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#2
Have you ever been able to Telnet to this PPmac?
Are you on a network or a point to point connection?
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#3
(12-06-2010, 12:01 PM)bradp Wrote: Have you ever been able to Telnet to this PPmac?
Are you on a network or a point to point connection?

Yes, we originally used it a few weeks ago from a laptop running win7. Both Atul and Sina helped us get the PPMAC IDE running and we were able to talk to it and eventually tune a motor. I am now using a different host CPU. a Linux box. I am using VMWare to run Win7 and have the PPMAC IDE running on that. I can ping from both Linux and Win7 to reach the board, but cannot telnet in.

The connection is point-to-point using a cat 5 crossover cable. The IP address of the network interface on the host side is 192.168.0.100.
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#4
From the linux side without the win7 vmware running try to SSH to the ppmac. Let me know what happens
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#5
(12-06-2010, 01:01 PM)bradp Wrote: From the linux side without the win7 vmware running try to SSH to the ppmac. Let me know what happens

[erikj@laplace erikj]$ ssh 192.168.0.200
ssh: connect to host 192.168.0.200 port 22: Connection refused
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#6
(12-06-2010, 01:11 PM)erikj Wrote:
(12-06-2010, 01:01 PM)bradp Wrote: From the linux side without the win7 vmware running try to SSH to the ppmac. Let me know what happens

[erikj@laplace erikj]$ ssh 192.168.0.200
ssh: connect to host 192.168.0.200 port 22: Connection refused
Hi Brad, just to be sure it isn't the cable (although ping shouldn't work if it is), I tried using a different network cable. This particular cable is straight through, not a crossover. Evidently one of the two sides or both can auto negotiate and account for the cable. In the end I get the same results: I can ping but I cannot telnet or ssh into the PPMAC.

Thanks,

Erik
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#7
(12-06-2010, 01:29 PM)erikj Wrote:
(12-06-2010, 01:11 PM)erikj Wrote:
(12-06-2010, 01:01 PM)bradp Wrote: From the linux side without the win7 vmware running try to SSH to the ppmac. Let me know what happens

[erikj@laplace erikj]$ ssh 192.168.0.200
ssh: connect to host 192.168.0.200 port 22: Connection refused
Hi Brad, just to be sure it isn't the cable (although ping shouldn't work if it is), I tried using a different network cable. This particular cable is straight through, not a crossover. Evidently one of the two sides or both can auto negotiate and account for the cable. In the end I get the same results: I can ping but I cannot telnet or ssh into the PPMAC.

Thanks,

Erik

Is there a way to use USB or RS-232 to get a console connection into the PPMAC so we can see what is going on?
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#8
(12-06-2010, 01:36 PM)erikj Wrote:
(12-06-2010, 01:29 PM)erikj Wrote:
(12-06-2010, 01:11 PM)erikj Wrote:
(12-06-2010, 01:01 PM)bradp Wrote: From the linux side without the win7 vmware running try to SSH to the ppmac. Let me know what happens

[erikj@laplace erikj]$ ssh 192.168.0.200
ssh: connect to host 192.168.0.200 port 22: Connection refused
Hi Brad, just to be sure it isn't the cable (although ping shouldn't work if it is), I tried using a different network cable. This particular cable is straight through, not a crossover. Evidently one of the two sides or both can auto negotiate and account for the cable. In the end I get the same results: I can ping but I cannot telnet or ssh into the PPMAC.

Thanks,

Erik

Is there a way to use USB or RS-232 to get a console connection into the PPMAC so we can see what is going on?

Hi Brad,

I just power cycled the PPMAC and now I can get in just fine. Sorry for the bother -- I should have tried that before calling for help.

Thanks for your replies.

Erik
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