Troubleshooting

Here are the problems that come up most often, with cause and solution.

First step for DNS problems: In the result, open the Befehl (command) tab, copy the dig command and run it in the terminal. If you get the same result there, the problem is DNS or the network, not the app.

The app won’t start

macOS says the app is damaged or comes from an unidentified developer. The DMG from the download page is signed and notarized by Apple and opens without this message. Download the app again from there and drag it into the Applications folder.

Only a copy that doesn’t come from the official DMG, for example one passed on as a zip or via AirDrop, may be blocked by macOS. In that case, open it once via System Settings › Privacy & Security › Open Anyway.

The app needs macOS 12 or later. It won’t launch on older versions.

A tool is missing

Tools a platform can’t run are hidden rather than greyed out. In the browser, for example, the SMTP test, TLS certificate, port check, ping and traceroute are missing; on iOS and Android, the SMTP test, port check, ping and traceroute. Einstellungen › Über (Settings › About) shows how many tools are available on your platform.

A tool with a lock isn’t hidden; it requires a license.

DNS queries without answer

„Keine Antwort von … nach … s“ (no answer from … after … s) on every check. Usually the network blocks outgoing DNS queries on port 53, as some corporate, hotel or guest networks do that only allow their own DNS server. To fix it:

1. Open Einstellungen (settings) and under Resolver, set Direkte Abfragen (UDP/TCP 53) to DNS over HTTPS (siehe unten).
2. Below that, choose a provider under DNS over HTTPS.

Queries then go encrypted over port 443, which is open almost everywhere. Alternatively, choose Resolver des Systems (system resolver), since such networks usually let their own resolver through.

Only some queries time out. Slow name servers or blacklists sometimes need longer. Increase Zeitlimit je Abfrage (timeout per query) under Einstellungen › Resolver, for example to 10 seconds.

Results differ from what others see. Your system’s resolver may have old answers cached or filter names. Use the Standard-Resolver button next to the input field to pick a public resolver for this query.

SMTP test: no connection on port 25

„Keine Verbindung zu …:25“ (no connection) with a timeout. Many internet providers block outgoing port 25 for home and mobile connections, and corporate networks often do too. Then it’s not the mail server’s fault. Test from another network or choose port 587. More in the SMTP test article.

Blacklist check

„Spamhaus ZEN: nicht prüfbar“ (not checkable). Spamhaus doesn’t answer queries through large public resolvers and DNS over HTTPS. Enter a free Spamhaus-DQS-Schlüssel under Einstellungen › Blacklists. See Blacklist check.

Other lists “nicht prüfbar”. The list refuses the chosen resolver. Check with another resolver, for example the System-Resolver.

Lots of „ungültige Antwort“ (invalid answer). The resolver rewrites NXDOMAIN answers, for example to an ISP search or ad page. Choose a public resolver.

„… Abfragen ohne Antwort“ (queries without answer). Some lists are overloaded or discontinued. That’s usually not a problem with your address.

In the browser

„… nicht abrufbar“ or „Abruf fehlgeschlagen“ (could not be fetched) in the HTTP check, MTA-STS or BIMI. Browsers often block requests to other sites via CORS. The desktop app checks without this limit.

„WHOIS über Port 43 ist im Browser nicht möglich“. For domains without RDAP, such as .de, you need the desktop app.

License

The messages appear under Einstellungen › Lizenz (Settings › License).

Message	Solution
Bitte den Lizenzschlüssel einfügen.	The field is empty. Paste the key.
Der Lizenzserver ist nicht erreichbar. Der Schlüssel wurde nicht gespeichert.	Server not reachable, key not saved. Check your internet connection; a firewall or proxy may be blocking license.inwendo.cloud.
Der Lizenzserver kann gerade nicht prüfen. Bitte später erneut versuchen.	A problem on our side. Click Erneut prüfen (check again) later.
Der Lizenzschlüssel ist nicht lesbar. Bitte vollständig einfügen.	Something got cut off while copying.
Diese Lizenz gilt für eine andere inwendo-Software.	Key for the wrong app, for example the iw Build Station.
Das ist kein inwendo-Lizenzschlüssel. / Die Signatur des Lizenzschlüssels ist ungültig.	Copy the key from the email again.
Der Kaufcode wurde nicht gefunden.	Purchase code not found. Contact us via Request a license.
Nicht bestätigt – bitte mit Internetverbindung erneut prüfen	The last successful check was over 14 days ago. Click Erneut prüfen with a connection.
Abgelaufen am …	The license has expired. Request a new one.

MCP server not reachable

Go through these points in order:

1. Is the app running? The app’s MCP server only lives while the app is open.
2. Is it switched on? Einstellungen › MCP-Server › MCP-Endpunkt anbieten must be on. If it says „Start fehlgeschlagen: …“ (start failed), switch it off and on again.
3. Is the address right? If port 8789 was in use at launch, the server runs on a different port. The app points this out in the settings. Quit the program occupying the port and restart the app, or set up the assistant with the address shown.
4. Is the token right? „Zugriffstoken fehlt oder ist falsch“ (access token missing or wrong) means the assistant has an old token, for example after Neues Token. Copy the command from the settings and set up the assistant again.
5. Claude Desktop? It needs Node.js for npx mcp-remote.
6. “Dieser Check braucht eine inwendo-Lizenz”? Enter the license in the app. The three free tools work without one.

The MCP server is only available in the desktop apps. See MCP server.

Updates

The button says „Updates nur in signierten Releases“. You’re using a version you built yourself. Download the app from the download page. See Updates.

Still not solved?

Copy the report via Exportieren › Als JSON kopieren (Export › copy as JSON) and send it to us with a short description. You’ll find contact details at inwendo.de.