FiveM License Key Error – Fix sv_licenseKey & IP Mismatch

Quick answer: FiveM license key errors: check key at keymaster.fivem.net, set sv_licenseKey in server.cfg and match server IP with registered IP.

If you landed here: Console shows "Could not authenticate server license key", server won't start or players can't join.

Error → fix

Symptom / log	Fix
Could not authenticate server license key	Check key + IP on Keymaster
Invalid license key	Copy key without spaces
Key after server move	Generate new key for new IP

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Frequently asked questions (FAQ)

Could not authenticate server license key – what to do?

Check key at keymaster.fivem.net. sv_licenseKey in server.cfg must match exactly. Server IP must match registered IP.

License key invalid after IP change?

Update server IP in CFX Keymaster or generate new key. Update server.cfg and full restart.

Where to enter the key?

In server.cfg: sv_licenseKey "cfxk_..." – keep quotes. In txAdmin under Settings → Server → License Key.

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FiveM License Key Error – Fix sv_licenseKey & IP Mismatch

Error → fix

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Frequently asked questions (FAQ)

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