EPICS_CA_ADDR_LIST and multiple instances of a SoftIOC on Windows

[Carsten Winkler via Tech-talk <tech-talk at aps.anl.gov>]

Hello tech-talkers,

I have the following situation. My computer is running MS Windows and
several SoftIOCs (EPICS BASE 7.0.6.1). Furthermore, there is a CA
gateway in the local network.

Without EPICS environment variables I get the following results:

cainfo TestPV:aiExample
CA.Client.Exception...............................................
    Warning: "Identical process variable names on multiple servers"
    Context: "Channel: "TestPV:aiExample", Connecting to:
my_computer.bessy.de:5064, Ignored: ca_gateway.bessy.de:5064"
    Source File:
D:\epics\epics-base-R7.0.6.1\modules\ca\src\client\cac.cpp line 1320
    Current Time: Tue Sep 13 2022 08:19:36.713908800
..................................................................
TestPV:aiExample
    State:            connected
    Host:             my_computer.bessy.de:5064
    Access:           read, write
    Native data type: DBF_DOUBLE
    Request type:     DBR_DOUBLE
    Element count:    1

cainfo TestPV:ai1
TestPV:ai1
    State:            connected
    Host:             my_computer.bessy.de:62425
    Access:           read, write
    Native data type: DBF_DOUBLE
    Request type:     DBR_DOUBLE
    Element count:    1
CA.Client.Exception...............................................
    Warning: "Identical process variable names on multiple servers"
    Context: "Channel: "TestPV:ai1", Connecting to:
my_computer.bessy.de:62425, Ignored: ca_gateway.bessy.de:62425"
    Source File:
D:\epics\epics-base-R7.0.6.1\modules\ca\src\client\cac.cpp line 1320
    Current Time: Tue Sep 13 2022 08:19:27.881409000
..................................................................

Okay, lets fix the issue "Identical process variable names on multiple
servers".
set EPICS_CA_ADDR_LIST=ca_gateway.bessy.de
set EPICS_CA_AUTO_ADDR_LIST=NO

Now I get following results:

cainfo TestPV:aiExample
TestPV:aiExample
    State:            connected
    Host:             ca_gateway.bessy.de:5064
    Access:           read, write
    Native data type: DBF_DOUBLE
    Request type:     DBR_DOUBLE
    Element count:    1

cainfo TestPV:ai1
Channel connect timed out: 'TestPV:ai1' not found.

Obviously the variables from the second SoftIOC with port 62425 are not
found anymore. I have the same problem when I enter the address of the
client computer in the EPICS_CA_ADDR_LIST.
How do I solve this problem?

Cheers,
Carsten



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