: net_adm:ping not working -- still not answered

Michael McDaniel <>
Fri Sep 1 20:27:33 CEST 2006


 Does the following work?

 C:\> ping localhost
 C:\> ping my-server


 If no, get them working before delving into the erlang ping.
 If yes, hmmm.  Not certain though maybe my-server hostname
 should be changed to myserver (possibly the dash is problematic).


~M

On Fri, Sep 01, 2006 at 10:54:35AM -0700, erlang wrote:
> Yes, you have shown the tests I am using, very simple cases. 
> But I get pangs, and timeouts.
> 
> I agree it is probably due to a  misconfigured network. What I have
> is one Windows Server 2003 sp1 machine that is setup for a 
> peer-to-peer workgroup, with no local dns server, domain controller, 
> etc. I agree that my problem is most likely a network configuration 
> that is not Erlang friendly. I couldn't find a prerequisites list for Erlang 
> so I'm not sure what it needs. I have used many applications that have no
> problem opening ports on localhost.
> 
> 
> > 
> > Well, it should work.
> > 
> > Try the following diagnosis:
> > 
> > $ erl -sname a
> > $ erl -sname b
> > 
> > ()> erl_epmd:names().
> > {ok,[{"a",43500},{"b",43505}]}
> > ()> inet:gethostbyname("my-server").
> > {ok,{hostent,"my-server",[],inet,4,[{192,168,0,100}]}}
> > ()> net_adm:ping('').
> > pong
> > ()> nodes().
> > ['']
> > 
> > 
> > And if that does not work as above try:
> > 
> > $ erl -sname 
> > $ erl -sname 
> > 
> > ()> inet:gethostbyname("localhost").
> > {ok,{hostent,"localhost",[],inet,4,[{127,0,0,1}]}}
> > ()> erl_epmd:names().
> > {ok,[{"b",43527},{"a",43530}]}
> > ()> net_adm:ping('').
> > pong
> > ()> nodes().
> > ['']
> > 
> > 
> > I am suspecting your machine may have misconfigured network.
> > 
> > To make sure the cookie is the same, add the argument
> > -setcookie my-cookie4711
> > to the command line of both nodes, but if you have the wrong cookie,
> > the target node should print: 
> > =ERROR REPORT==== 1-Sep-2006::09:40:06 ===
> > ** Connection attempt from disallowed node  ** 
> > when net_adm:ping() fails.
> > 
> > 
> > 
> > On Thu, Aug 31, 2006 at 09:29:48AM -0700, erlang wrote:
> > > > 
> > > > Sorry, this is indeed a typo in my email. Should be:
> > > > ()1> net_adm:ping('').
> > > > 
> > > > > 
> > > > > Hi, is the colon ":" just a typo in your email? It should be
> > > > > "@
>  you can see from the node name in the Erlang shell prompt.
> > > > > 
> > > > > Best Regards
> > > > > Lennart
> > > > > 
> > > > > > ()1> net_adm:ping('a:my-server').
> > > > > 
> > > > > > I can't get the ping-pong distributed example to work, so I tried simply
> > > > > > pinging another node. This doesn't work either.
> > > > > > 
> > > > > > os: windows server 2003, machine name is my-server.
> > > > > > EShell v5.5.1
> > > > > > 
> > > > > > command lines: erl -sname a
> > > > > >                             erl -sname b
> > > > > > 
> > > > > > ()1> net_adm:ping('a:my-server').
> > > > > > 
> > > > > > always returns pang. The cookie file is being read, and the cookie is
> > > > > > the same in both nodes. What to try next?
> > > > > > 
> > > > > > 
> > > > > > 
> > > > > > 
> > > > > > 
> > > > > > 
> > > 
> > > 
> > 
> > -- 
> > 
> > / Raimo Niskanen, Erlang/OTP, Ericsson AB 
> 
> 
> 

-- 
Michael McDaniel
Portland, Oregon, USA
http://autosys.us
+1 503 283 5284



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