Excerpts from Solomon Mwangi's message of 2017-01-13 12:55:12 +0300:
> I have Koha running on an Linux server running Ubuntu 12.04
> Koha runs fine - no issues.
> I have been trying to connect to it via ZS39 but unable to connect.
> Yaz client gives me this error = System (lower-layer) error
> Help/ideas would be appreciated.
I assume you're talking about Z39.50? There is a Wiki page describing
how to troubleshoot problems:
But I've found that a few details in that document were slightly wrong
or incomplete for my installation (Koha 16.11 on Debian 8). Here are
the notes I wrote for myself as I was getting Z39.50 to work on my
installation (all tasks performed while logged in as root):
To enable Z39.50, edit the file `/etc/koha/sites/LIBRARYNAME/koha-conf.xml`,
where LIBRARYNAME is the name you chose when you created your Koha instance.
Near the top of that file is a line that looks like this:
Uncomment that line by removing the `<!--` and `-->` lines before and after it.
Then replace `nnn` with an unused port number, preferably something greater
than 1023. I chose 9998.
Farther down in file, around line 180, is a section starting with a line that
looks like this:
<!-- PUBLICSERVER'S BIBLIOGRAPHIC RECORDS -->
Below that is a line that looks like this:
<server id="publicserver" listenref="publicserver">
Remove the start-of-comment line (`<!--`) before that line.
Now move down to around line 260, where you will see this line:
Remove the end-of-comment line (`-->`) after that line.
Finally, save the file and exit the editor.
Restart Zebra (the program that handles searches in Koha):
Verify that Zebra is now listening on the port you chose (9998 in the
example above) by doing this:
netstat -pn --tcp --listen | grep 9998
If things are working, you should see a line that looks like this:
tcp 0 0 0.0.0.0:9998 0.0.0.0:* LISTEN
If things are not working, you won't see any output.
As a final check, you can try making a Z39.50 connection:
If things are working, you should see a few lines of output, including a line
that looks like this:
Connection accepted by v3 target.
and then a prompt line:
If things aren't working, you'll see an error message like this:
Connecting...error = System (lower-layer) error: Connection refused
Exit the `yaz-client` program by hitting Ctrl-D or typing `exit` followed by
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