AdguardTeam/AdGuardHome · error

invalid value %q: expected one slash

Error message

invalid value %q: expected one slash

What it means

Each ipset configuration line must have the form 'host1,host2/ipset1,ipset2'. This error means the line did not contain exactly one '/' separator after trimming.

Source

Thrown at internal/ipset/ipset_linux.go:235

	m.ipv4Conn, err = m.dial(netfilter.ProtoIPv4, conf)
	if err != nil {
		return fmt.Errorf("dialing v4: %w", err)
	}

	m.ipv6Conn, err = m.dial(netfilter.ProtoIPv6, conf)
	if err != nil {
		return fmt.Errorf("dialing v6: %w", err)
	}

	return nil
}

// parseIpsetConfigLine parses one ipset configuration line.
func parseIpsetConfigLine(confStr string) (hosts, ipsetNames []string, err error) {
	confStr = strings.TrimSpace(confStr)
	hostsAndNames := strings.Split(confStr, "/")
	if len(hostsAndNames) != 2 {
		return nil, nil, fmt.Errorf("invalid value %q: expected one slash", confStr)
	}

	hosts = strings.Split(hostsAndNames[0], ",")
	ipsetNames = strings.Split(hostsAndNames[1], ",")

	if len(ipsetNames) == 0 {
		return nil, nil, nil
	}

	for i := range ipsetNames {
		ipsetNames[i] = strings.TrimSpace(ipsetNames[i])
		if len(ipsetNames[i]) == 0 {
			return nil, nil, fmt.Errorf("invalid value %q: empty ipset name", confStr)
		}
	}

	for i := range hosts {
		hosts[i] = strings.ToLower(strings.TrimSpace(hosts[i]))

View on GitHub (pinned to b41aefbe51)

Solutions

1. Rewrite the line as 'domain[,domain...]/ipsetname[,ipsetname...]'
2. Remove stray slashes or empty lines that aren't blank
3. Reload/restart the service after fixing the config

Example fix

# before
- example.org
# after
- example.org/myset

func validIpsetLine(line string) bool {
	parts := strings.Split(strings.TrimSpace(line), "/")
	return len(parts) == 2
}

When it happens

Trigger: parseIpsetConfigLine is called with a conf.Lines entry like 'example.org' (no slash), 'a/b/c' (two slashes), or 'a / b / c'.

Common situations: YAML config typo: using spaces instead of a slash, forgetting the ipset part, or including a URL-like value in the ipset config line.

Related errors

• invalid value %q: empty ipset name
• networksetup failed to set dns servers: %w
• found no dns servers in %s
• writing conf: %w
• invalid pattern %q: %w

AI-assisted analysis of AdguardTeam/AdGuardHome@b41aefbe51 (2026-08-27). Data as JSON: /api/errors/228b992de1b2e805. Report an issue: GitHub.