Hej Greg,
… Can I force it to listen on 5076…
Typically not.
The TCP/IP stack is thinking that 5076 is “not allowed” (please forgive my wording, network experts)
There may be different reasons:
The port is "in use”, and that’s the end of the story.
the lsof command should report it.
Or, it has been in use, and now it is in the “time wait” state.
This state should be released after typically 120 seconds or so.
So please be aware that things may change while you are debugging.
What does
netstat -a -n -t | grep 5076
give you ?
(You may have to install netstat. It is a useful tool, but not installed in
all Linux distributions by default)
HTH
/Torsten
> On 21 Aug 2023, at 18:05, Leblanc, Gregory via Tech-talk <tech-talk at aps.anl.gov> wrote:
>
> Can I force it to listen on 5076 instead of falling back to another port? It seems to be falling back to the dynamically assigned port number excessively. I checked to see if anything was bound to 5076 with lsof |grep 5076 and ss -tulpn |grep 5076, but it still reported a dynamically assigned port.
>
> I don't think this is the whole story, because on my latest invocation of the IOC I did NOT get a dynamic port, but phoebus still told me that the PVs were disconnected, and it tried to look at a stale port number to communicate with the IOC. Eventually I seem to be able to get Phoebus to switch back to the default ports, but so far it's just a process of trial and error to find something that works.
> Greg
>
>> -----Original Message-----
>> From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Leblanc, Gregory
>> via Tech-talk
>> Sent: Monday, August 21, 2023 10:26 AM
>> To: tech-talk at aps.anl.gov
>> Subject: [External] Trouble with pva:// on Phoebus with often-restarted IOCs
>>
>> Use caution with links and attachments.
>>
>> Hi folks,
>>
>> I'm working on developing an HMI here at the same time that I'm developing the
>> .db files. I'm using the Phoebus nightly builds on a windows machine, and epics-
>> base checked out from github, compiled on CentOS 9 Stream. I'm also trying to
>> use pva:// for all the PVs in Phoebus . My typical workflow is to add a new record
>> to the .db file, stop the IOC, make distclean, make, and restart with st.cmd.
>> Next, I'll add a new widget to the Phoebus interface. The first time I launch the
>> Phoebus display for the day, everything seems to work OK. On all subsequent
>> times, the PVs show up in a disconnected state. If I switch to ca://, I don't see this
>> issue. I think this is somehow related to the dynamically assigned TCP port
>> numbers, but I'm unclear on what changes between the first launch and all
>> subsequent launches. In my IOC output, I see:
>>
>> First launch:
>> 2023-08-21T09:13:00.122 Using dynamically assigned TCP port 38547.
>>
>> Next launch:
>> 2023-08-21T09:13:46.475 Using dynamically assigned TCP port 34715.
>>
>> And in the Error Log on Phoebus:
>> 2023-08-21 10:21:46 WARNING [org.epics.pva] Cannot connect to TCP
>> /10.0.0.241:34715
>>
>> I have confirmed that indeed I cannot telnet to the second port number listed
>> when things aren't working, although I haven't tried the telnet test when things
>> ARE working, but I'll try to do that today. I've opened ports 5076/udp, 5075/tcp,
>> 5064 and 5065 both tcp and udp. Any thoughts on where to go next?
>> Greg
>>
>> --
>> Gregory Leblanc
>> Accelerator Engineer
>> Edwards Accelerator Lab - Ohio University
>> 123 University Terrace
>> Athens, OH 45701 USA
>> leblanc at ohio.edu
>> M: (401) 52-OUAL1 or (401) 526-8251
>
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