Forum Discussion
RFhelp0
Mar 11, 2026Copper Contributor
Universal Print Connect 2.4.9459.590 Service keeps stop /start
Hi Support, I installed Universal Print Connector 2.4.9459.590 on a Windows Server 2025 Standard server. The Print Connector Service keeps stopping and restarting. When the service starts, I am brie...
Charlie34000
Apr 03, 2026MCT
Hi,
Thanks for sharing the screenshots — they actually reveal the root cause.
Your port 8091 is already owned by HTTP.SYS (PID 4), not by the Universal Print Connector. That’s why the connector fails with “Failed to initialize authentication” and stops immediately: it cannot register its WCF endpoint.
You can confirm the reservation with:
netsh http show urlaclLook for an entry containing 8091.
✔️ Fix
Remove the conflicting reservation:
netsh http delete urlacl url=http://+:8091/Then restart the Universal Print Connector service.
If you prefer, you can also switch the connector to another port, but cleaning the HTTP.SYS reservation is usually the correct fix.
Let me know what netsh http show urlacl returns — that will confirm the exact conflict.