Does RMI all you to connect to hosts on other machine?

I have been attempting to connect to another server with the following host name
http://mhsc04.omc.bt.co.uk/
The program comes back with a connection refused exception even though i used a policy. Which is below.
grant {
permission java.security.AllPermission "", "";
Does RMI allow you to connect to host on other machines and if so how does it allow you to do this
Thanks in advance

I have sorted this problem of connection refused as i had forgotten to start the rmiregistry on that hosts machine now i get an Unmarshalling exception which i have posted before

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Why does RMI server sets its connection address?

I use RMI for several years now and it is really great. But what I did not understand all this time: why the server has to inject its own address to a client. I only see disadvantages of this behavior and this is a big pitfall to all newbies using RMI (two nics, different networks connecting to one server).
So my question is, what is the reason for this kind of design? Do I miss some essential security/network point?
Probably a proper callback mechanism might be one reason, but what else?
I don't need answers like it is all documented and it is easy. As I said I am used to it, but I believe it is not as easy as it sounds and it is hard to understand for a lot of people. I want to give you one example: We are developing and servicing products which are operated in closed private networks. For service and diagnostics we have to connect to these networks via VPN connections. In such cases it is hard to connect to the system applications because all the RMI servers insists on their own address/name which might be know only to the local network.
Thanks in advance for your attention
Thomas

dannyyates wrote:
The registry and the server could be on different machines, so the client would know the address of the registry in order to lookup the remote object, but the registry would have to tell the client where the server is. That is, after all, the whole point of the registry!Ok I got this,
Also, there are facilities to give the client a different address to the servers actual address. This is used in cases where, for example, the server is behind a NAT firewall. The server will only be aware of its internal address, but clients beyond the firewall will need to use the server's external address to reach it, so the objects returned from the registry will need to have the server's external address embedded in them even if the server and the registry are running on the same machine.Ok, so you have to set this to a reachable address for all clients. But in general the client already knows this since it reached the server already. So I don't see the point the server should have to change this afterward.
However I still think only the first point is not enough to have so much hassle in all other environments. Do you know a way to override the registry or possibly the client registration to ignore what the server does say to it as the "real" address?

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How does connection to host really work?

I've been trying to debug this myself, but there seems to be a missing piece, and I'd like some help understanding the components and sequence of the process.
My immediate issue is, how do I get past the"ORA-12170: TNS:Connect timeout occurred" error shown below? It seems that hostname "hcm" is recognized as valid but then points to nowhere.
Environment: Windows 2000, Oracle 10g rel 2, localhost (IP starts with 127), MS loopback adaptor (IP starts with 192), computer name dimension4100, primary dns suffix ora.newmiddleclass.com, database name (same as SID) is hcm.
etc\hosts file:
127.0.0.1 dimension4100.ora.newmiddleclass.com localhost
192.168.255.255 dimension4100.ora.newmiddleclass.com dimension4100
192.168.255.255 dimension4100.ora.newmiddleclass.com hcm
192.168.255.255 dimension4100.ora.newmiddleclass.com hcm2
192.168.255.255 dimension4100.ora.newmiddleclass.com hcm3
192.168.255.255 dimension4100.ora.newmiddleclass.com no-tns
I'm trying to connect via sqlplus with this syntax:
sqlplus SYS/pw@hcm
ORA-12154: TNS:could not resolve the connect identifier specified
when I try to connect via @ using anything other than localhost or dimension4100 or a host name specified in the hosts file.
- Implies that this is the first step in the process
...so using host string @hcm as shown above avoids the 12154 error. Next, one of two things happens:
ORA-12541: TNS:no listener
Only with localhost or dimension4100. e.g.
sqlplus SYS/pw@dimension4100
- or -
ORA-12170: TNS:Connect timeout occurred
Only with hostnames that are mapped to 192 in hosts file (except for dimension4100). Doesn't matter if the hostname is in tnsnames.ora. e.g.
sqlplus SYS/pw@hcm
sqlplus SYS/pw@hcm2
sqlplus SYS/pw@no-tns ("no-tns" is not defined in tnsnames.ora)
Note:
- I've verified that the hosts and ora files I've edited are really the files that the system is reading.
- I can ping any hostname in the hosts file and get the correct IP address.
- I can connect via sqlplus / as sysdba
- I have to start the listener manually via lsnrctl start. It listens via protocol tcp on the loopback IP (192) on port 1521, as well as protocol ipc (EXTPROC1ipc)
- lsnrctl services:
LSNRCTL for 32-bit Windows: Version 10.2.0.1.0 - Production on 29-SEP-2008 09:22:40
Copyright (c) 1991, 2005, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0
LOCAL SERVER
The command completed successfully
(Is this a problem? Should it be using the TCP protocol?)
- Services via control panel:
(started)
OracleOraDb10g_home1iSQL*Plus
OracleOraDb10g_home1TNSListener
OracleServiceHCM
(disabled)
OracleJobSchedulerHCM
- tnsnames.ora:
HCM3 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.255.255)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = OracleServiceHCM)
HCM2 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.255.255)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = HCM.ora.newmiddleclass.com)
HCM =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.255.255)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = HCM.ora.newmiddleclass.com)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
...so....how do I get past the"ORA-12170: TNS:Connect timeout occurred" error?
Thanks.

Ok Justin, so you're saying that because I hard-coded the IP address in tnsnames.ora, the etc\hosts file is not used for the connection. My current entry for hcm is:
HCM =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.255.255)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = HCM.ora.newmiddleclass.com)
I changed that to
HCM =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.255.255)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = HCM)
I also tried
HCM =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.255.255)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = HCM)
(SID = HCM)
and
HCM =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.255.255)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = HCM.ora.newmiddleclass.com)
(SID = HCM)
also trying hcm in lower case, but in all scenarios I got the same error:
ORA-12170: TNS:Connect timeout occurred
And I tried vetris' suggestion re telnet (not ping) on both IP addressess and I get error:
Could not open a connection to host on port 1521: Connect failed

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Does RMI all you to connect to hosts on other machine?

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