What causes "Domain must not contain slashes!" in nextcloud/all-in-one?

Enter only the bare hostname: 'cloud.example.com' — no scheme, no path, no trailing slash

nextcloud/all-in-one · error · InvalidSettingConfigurationException

Domain must not contain slashes!

Error message

Domain must not contain slashes!

What it means

Second check in ConfigurationManager::setDomain(): the domain string must not contain any '/'. Users hit it by pasting a full URL or a URL-with-path instead of a bare hostname. It throws InvalidSettingConfigurationException → HTTP 422 with this message shown in the AIO interface. The check runs before hostname-format validation and cannot be skipped.

Source

Thrown at php/src/Data/ConfigurationManager.php:604

            return trim((string)file_get_contents($path));
        }
        return '';
    }

    /**
     * @throws InvalidSettingConfigurationException
     *
     * We can't turn this into a private validation method because of the second argument.
     */
    public function setDomain(string $domain, bool $skipDomainValidation) : void {
        // Validate that at least one dot is contained
        if (!str_contains($domain, '.')) {
            throw new InvalidSettingConfigurationException("Domain must contain at least one dot!");
        }

        // Validate that no slashes are contained
        if (str_contains($domain, '/')) {
            throw new InvalidSettingConfigurationException("Domain must not contain slashes!");
        }

        // Validate that no colons are contained
        if (str_contains($domain, ':')) {
            throw new InvalidSettingConfigurationException("Domain must not contain colons!");
        }

        // Validate domain
        if (filter_var($domain, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME) === false) {
            throw new InvalidSettingConfigurationException("Domain is not a valid domain!");
        }

        // Validate that it is not an IP-address
        if(filter_var($domain, FILTER_VALIDATE_IP)) {
            throw new InvalidSettingConfigurationException("Please enter a domain and not an IP-address!");
        }

        // Skip domain validation if opted in to do so

View on GitHub (pinned to 6b788eec5e)

Solutions

Enter only the bare hostname: 'cloud.example.com' — no scheme, no path, no trailing slash
If scripting, extract the host first: $host = parse_url($url, PHP_URL_HOST);
Leave out 'https://' — AIO constructs URLs itself in later validation steps

Example fix

// before
domain = 'https://cloud.example.com/nextcloud'
// after
domain = 'cloud.example.com'

Defensive patterns

Strategy: validation

Validate before calling

// Strip pasted URLs down to the host before submitting
if (str_contains($domain, '/')) {
    $domain = parse_url($domain, PHP_URL_HOST) ?? $domain;
}
if (str_contains($domain, '/')) {
    $errors[] = 'Submit a bare hostname without scheme or path';
}

Try / catch

use AIO\Data\InvalidSettingConfigurationException;

try {
    $configurationManager->setDomain($domain, $skipDomainValidation);
} catch (InvalidSettingConfigurationException $e) {
    $formErrors[] = $e->getMessage(); // safe to display verbatim
}

Prevention

Normalize input with parse_url(..., PHP_URL_HOST) before storing or posting
Keep the domain field a plain text input without URL autofill
Trim whitespace from pasted values

When it happens

Trigger: domain='https://cloud.example.com' (scheme pasted); domain='cloud.example.com/' (trailing slash); domain='cloud.example.com/nextcloud' (path appended); browser autofill inserting the full URL into the domain field.

Common situations: Copy-pasting from the browser address bar; users assuming the field wants a URL; scripts forwarding a URL variable straight into the domain setting.

Related errors

AI-assisted analysis of nextcloud/all-in-one@6b788eec5e (2026-08-21). Data as JSON: /api/errors/bfdcca5ebf65ae8f. Report an issue: GitHub.