Debug ID: D20347597 | The Zotero Connector was unable to communicate with the Zotero desktop app...

kmilgram
I have a problem with Zotero 8.0.1 x64 on Linux Mint: the "Zotero Connector" is running on the wrong port and won't connect to the Zotero client.

https://s3.amazonaws.com/zotero.org/images/forums/u3116/e13h0xljcrmu0da3pngu.png

The problem started after the upgrade-in-place procedure completed.

## OS Info

```
eric@envy:~$ cat /etc//os-release
NAME="Linux Mint"
VERSION="21.3 (Virginia)"
ID=linuxmint
ID_LIKE="ubuntu debian"
PRETTY_NAME="Linux Mint 21.3"
VERSION_ID="21.3"
HOME_URL="https://www.linuxmint.com/"
SUPPORT_URL="https://forums.linuxmint.com/"
BUG_REPORT_URL="http://linuxmint-troubleshooting-guide.readthedocs.io/en/latest/"
PRIVACY_POLICY_URL="https://www.linuxmint.com/"
VERSION_CODENAME=virginia
UBUNTU_CODENAME=jammy
eric@envy:~$
```

```
eric@envy:~$ zotero --version
Zotero Zotero 140.7.0esr, Copyright (c) 2006-2025 Contributors
eric@envy:~$
```

In the browser, http://127.0.0.1:23124/connector/ping returns "Zotero is running".

```html
eric@envy:~$ html-beautify < <(curl -is --max-time 3 http://127.0.0.1:23124/connector/ping | tail -n 1)
<!DOCTYPE html>


Zotero is running

eric@envy:~$
eric@envy:~$
```

---

http://127.0.0.1:23119/connector/ping returns nothing in the browser.

```
eric@envy:~$ curl -i --max-time 3 http://127.0.0.1:23119/connector/ping
curl: (7) Failed to connect to 127.0.0.1 port 23119 after 0 ms: Connection refused
eric@envy:~$
```

---

`zotero-bin` is binding to 3 ports: 19876, 23116, and 23124.

| Netid | State | Recv-Q | Send-Q | Local Address:Port | Peer Address:Port | Process |
| ----- | ------ | ------ | ------ | ------------------ | ----------------- | --------------------------------------- |
| tcp | LISTEN | 0 | 5 | 127.0.0.1:19876 | 0.0.0.0:* | users:(("zotero-bin",pid=107161,fd=98)) |
| tcp | LISTEN | 0 | 5 | 127.0.0.1:23116 | 0.0.0.0:* | users:(("zotero-bin",pid=107161,fd=97)) |
| tcp | LISTEN | 0 | 37 | 127.0.0.1:23124 | 0.0.0.0:* | users:(("zotero-bin",pid=107161,fd=96)) |


When the Zotero app is closed, nothing is returned.

---

1. Can the connector port be changed?

2. Do you know why the server might be starting on port 23124 instead of port 23119?
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