[GemStone-Smalltalk] NetLDI connection error

[James Foster]

Hello Ahmed,

The “Connection was refused” error means that the client was not able to establish a connection with the NetLDI server. There are two likely explanations: (1) if your remote connection is from a different machine, then there is likely a connectivity issue (see below); and, (2) if you are on the same machine then it is likely that the port on which the server is listening is different from the port on which the client is calling. This will happen if you started NetLDI with name (gs64ldi) but you do not have that entry in the `/etc/services` so while it uses the name, it picks a port at random (this happens to me almost every time I set up GemStone on a new machine!). 

But as I think about it some more, there is another possible issue beyond a simple not able to connect explanation. GemStone 5.x is very old and with that version the NetLDI starts a Gem that listens for a second call from the client (more modern versions “inherit” the original connection). So, if you are on a server with a firewall and your client is remote then the client may not be able to call back to the server on a second port. There is a command-line argument for netldi (-p maybe?) that specifies which port range to be used for the callback. Make sure that those ports are open. A good way to test this is to see if you can use the RPC Topaz from the same machine. If it works with the local client but not with the remote client, then this is likely the issue.

Start NetLDI with debug (-d) on and see if you get more information.

James

> On Oct 11, 2022, at 9:32 AM, T Ahmed via GemStone-Smalltalk <gemstone-smalltalk at lists.gemtalksystems.com> wrote:
> 
> Hi
> Need help to fix an issue while trying to remote connect.
> I did new GemStone installation (GemStone 5.1.3.1) on Solaris. Able to configure netldi and database. Can start/stop netldi without any issue and also able to login the database with linked topaz session but get the below error when trying to establish remote topaz session. 
> Tried with both netldi configurations, running under root as well as guest mode with captive account but the results are same.
> The error is;
> “An error occurred concerning to the parent at callback port 49603:
> recv(256, ffbfbef8,6,0): errno=146, ECONNREFUSED, Connection was refused “
> 
> Would really appreciate any help to fix this issue. 
> 
> Regards 
> Ahmed
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