RE: Client failed to connect to local server on VxWorks and Pharlap

["Jeff Hill" <johill@lanl.gov>]

Ø  Do you have any clue what the issue might be?

 

Which server is in use?

o portable server library, standalone from an IOC (PCAS)

o original server, embedded in an IOC (rsrv)

 

The PCAS is more flexible in its configuration for which network interfaces it will receive connection request from (details are in the ca reference manual), but the rsrv server has a fixed configuration always receiving connection requests from all interfaces.

 

Also, whether a search broadcast sent out by clients over one of the local network interfaces will be seen by servers on the local host or not is part of the routing/loopback policy for the local os.

 

Furthermore, the ca client library typically sends search messages to the broadcast addresses of each LAN that is attached by default, but this can be changed with configuration (see the ca reference manual). By default, the client library builds its search address list by interrogating the network interfaces (see the code in libCom/osi/osd/default/osdNetIntf.c).

 

Jeff

______________________________________________________
Jeffrey O. Hill           Email        johill@lanl.gov
LANL MS H820              Voice        505 665 1831
Los Alamos NM 87545 USA   FAX          505 665 5107

 

Message content: TSPA

 

From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of lorna.zhang@ni.com
Sent: Thursday, October 21, 2010 10:35 PM
To: tech-talk@aps.anl.gov
Subject: Client failed to connect to local server on VxWorks and Pharlap

 

Hi All,

I wrote an EPICS Server and an EPICS Client based on EPICS Base. They work well on Windows platform. Now I'm porting them to VxWorks and Pharlap.

During porting, I found the issue that, if the client and server are on a single host (no matter VxWorks or Pharlap), the connection couldn't be established. Please refer to the table below.

Senario	Result
Server on Windows, Client on VxWorks/Pharlap	Function well.
Server on VxWorks/Pharlap, Client on Windows	Function well.
Server on VxWorks, Client on Pharlap	Function well.
Server on Pharlap, Client on VxWorks	Function well.
Both on Windows	Function well.
Both on VxWorks	Cannot connect.
Both on Pharlap	Cannot connect.

At the time the issue happens, I can create a client on a different platform to successfully connect to/communicate with the issuing server, I can also point the issuing client to connect to/communicate with another server on a different platform.

Do you have any clue what the issue might be?

Please let me know.

Thanks a lot in advance.

Lorna Zhang
National Instruments Shanghai
Tel: 86-21-50509810-3230