You moved to Citrix LAS in early 2026. It worked for a month, then suddenly, users are blocked with ‘No Licenses Available.’ Your License Server successfully registered, but it hasn’t successfully checked in for 30 days.
Symptom Matrix:
LAS Status: Online Activation Failed, Countdown: 0 Days, Port: 443 Blocked.
Architectural Root Cause:
The Citrix LAS service uses a different identity context than your browser. While you can see the portal, the local CitrixLicenseServer service is failing proxy NTLM authentication.
Surgical Fix:
Force system-wide proxy settings using netsh winhttp set proxy and whitelist https://*.citrix.network.
The April 15, 2026 deadline is a hard stop for Citrix file based licensing. [Don’t risk an outage due to connectivity drift]
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