[Bug 1918617] Re: osiSockTest fails

[Dirk Zimoch via Core-talk <core-talk at aps.anl.gov>]

Turns out it is a firewall problem (at least on CentOS 8).
Switching off the firewall makes the test succeed.

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https://bugs.launchpad.net/bugs/1918617

Title:
  osiSockTest fails

Status in EPICS Base:
  New

Bug description:
  osiSockTest reports one failure:
  # udpSockFanoutTest()
  # Interface 10.0.2.255:5064
  # Not LO
  # RX2 start
  # RX1 start
  # recvfrom error (11)
  # RX1 end
  # recvfrom error (11)
  # RX2 end
  # Result: RX1 0:0 RX2 0:0
  # Interface 192.168.122.255:5064
  # Not LO
  # RX1 start
  # RX2 start
  # recvfrom error (11)
  # RX2 end
  # recvfrom error (11)
  # RX1 end
  # Result: RX1 0:0 RX2 0:0
  ok 19 - Found non-loopback interface
  not ok 20 - Successes 0

  The code is in line 403:
      testOk(nsuccess>0, "Successes %u", nsuccess);

  
  Here is my ifconfig:
  enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
          inet 10.0.2.15  netmask 255.255.255.0  broadcast 10.0.2.255
          inet6 fe80::d9c8:1c30:9271:e21a  prefixlen 64  scopeid 0x20<link>
          ether 08:00:27:e4:35:68  txqueuelen 1000  (Ethernet)
          RX packets 262876  bytes 333781671 (318.3 MiB)
          RX errors 0  dropped 0  overruns 0  frame 0
          TX packets 74111  bytes 6531238 (6.2 MiB)
          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

  lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
          inet 127.0.0.1  netmask 255.0.0.0
          inet6 ::1  prefixlen 128  scopeid 0x10<host>
          loop  txqueuelen 1000  (Local Loopback)
          RX packets 8721  bytes 875985 (855.4 KiB)
          RX errors 0  dropped 0  overruns 0  frame 0
          TX packets 8721  bytes 875985 (855.4 KiB)
          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

  virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
          inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
          ether 52:54:00:8e:4b:63  txqueuelen 1000  (Ethernet)
          RX packets 0  bytes 0 (0.0 B)
          RX errors 0  dropped 0  overruns 0  frame 0
          TX packets 0  bytes 0 (0.0 B)
          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

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