HelpTroubleshooting

Find the cause by what you see.

Tip

Work from top to bottom: most problems are the network. Click a symptom to open it.

Finding devices

Nothing is found

Cause	Fix
macOS: local network not allowed	System Settings → Privacy & Security → Local Network → LJ Link on
Windows: firewall, or network set to Public	allow LJ Link for private networks, profile Private
not in the same network	everything on one switch or router; see basics
addresses not ready yet (no router)	wait up to a minute, search again
rekordbox, Engine DJ or SoundSwitch on this computer	quit them
Pioneer over Wi-Fi	use a cable
still unclear	Set up manually → Check connection names the reason

Direct cable and Wi-Fi: players twice or not at all (known bug)

Cause	Fix
without a router computer and players give themselves `169.254.x.x`; with Wi-Fi on the computer may send on the wrong adapter or receive every packet twice	quit LJ Link and start it again; Wi-Fi off; or a small switch or router in between. Please send a report while it happens

A player shows up twice

Cause	Fix
Wi-Fi and cable in the same network	Wi-Fi off
virtual adapters (VPN, Parallels, VMware, VirtualBox, Hyper-V, Docker)	switch them off
two players with the same number	Utility → Player No.
computer `169.254.x.x`, players from a router	same switch or router as the players

A Denon device is not found or keeps reconnecting

Cause	Fix
LJ Link 1.3.0	update to 1.3.1 or newer
Engine DJ, SoundSwitch, Resolume on this computer	close them
connection just broke	the device needs a few seconds; wait

“No track loaded” or no waveform

Cause	Fix
LJ Link older than 1.4.1	update
track not from a rekordbox export (streaming, CD, never analysed)	export with rekordbox, analysed
CDJ-3000 with new firmware, old export	export again with rekordbox 6 or 7
rekordbox on this computer	quit it
Denon: track not analysed	analyse in Engine DJ or on the device

Yellow note “Beat port 50001 is in use”

Cause	Fix
rekordbox, Beat Link Trigger, SoundSwitch or a second LJ Link	close it, search again; until then positions are estimated

The waveform jumps or stutters

Cause	Fix
CDJ-2000NXS2 and older report position only between beats	normal after a cue or loop; the CDJ-3000 is exact
busy network	own switch for the DJ gear

ON AIR shows the wrong deck

Cause	Fix
player number and mixer channel do not match	player 1 on channel 1, and so on
no sound at the master output	ON AIR needs audio

Serato decks have no playhead

Cause	Fix
Serato does not reveal the play position	a limit of Serato; track, BPM, key, waveform overview and beat grid come from the file. Serato
FLAC or M4A file	not read yet; MP3 and AIFF work

The desk does not react

Cause	Fix
grandMA2: Telnet off	Setup → Console → Global Settings → Telnet: Login Enabled
grandMA2: Error #44	user needs more rights
grandMA3: Receive Command off, prefix set	Receive Command Yes, prefix empty, Enable Input
effect not on that speed master	assign it
desk in another network	network setups
tempo jumps between two values	SEND BPM on one deck

No icon in the menu bar or next to the clock

Cause	Fix
LJ Link already runs	a second start only opens the interface; close the first
macOS hides it	System Settings → Menu Bar; a full menu bar hides icons
Windows hides it	behind the arrow next to the clock; drag it out

“Check for updates” fails

Cause	Fix
version 1.2.x	install the newest version by hand once
no internet	normal in a show network; update at home

Keep LJ Link open while the problem is there, gear connected.
Menu (☰) → Report a problem, or in the menu of the icon.
Describe gear, firmware, Mac or Windows and what you see. Leave Include diagnostic data ticked: version, adapters, devices and their state, what each deck receives, last log lines. No titles, covers or passwords. Show diagnostic data shows it before sending.
Send by email (to fehlermelden@nextphilm.de) or Report on GitHub. Or ask on Discord.

Something missing or wrong?

Ask in our Discord or report a problem. Reports from real gear help most, also when something does not work.