Hi Δημήτρης

You wrote:

> Which ports should I check? No Z39.50 service is working, not even the
> Library of Congress.

In Koha menu "Administration > Z39.50/SRU servers administration

you'll find the hostname/port for the Library of Congress are lx2.loc.gov:210 - thus you could test if this host is accessible from your own host:

$ telnet lx2.loc.gov 210
Trying 140.147.239.58...
Connected to lx2.loc.gov.
Escape character is '^]'.

$ nc -vz lx2.loc.gov 210
Connection to lx2.loc.gov (140.147.239.58) 210 port [tcp/z3950] succeeded!

If your output looks else you'll probably have to talk to your network/firewall administrator.

Hope this helps.

Best wishes: Michael
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Στις Παρ 13 Οκτ 2023 στις 10:24 π.μ., ο/η David Nind <da...@davidnind.com>
έγραψε:

One thing to look for is to see if the ports used for the Z39.50 services
you are trying to access are blocked by your organisation's firewall.

Or maybe the Z39.50 sources are no longer available... I'm sure there is a
way to check if they are, but not sure how to myself.

David Nind
New Zealand

On Fri, 13 Oct 2023 at 20:17, Δημήτρης Δαλαγιώργος <
dimitrios.dalagior...@gmail.com> wrote:

Dear all,

I have added several Z39.50 interfaces to my library but for some reason
searching through Z39.50 no longer works; I get a connection timeout error
message.

Where should I start looking to remedy this?

Kind regards,

Dimitrios Dalagiorgos
3rd high school of Kozani
Greece
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