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RFhelp0's avatar
RFhelp0
Copper Contributor
Mar 11, 2026

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 briefly able to log in, but it stops again shortly after.

 

I have change the ports to 8095 and that did not help.  

I verified that the required port is not already in use. Could this be an issue with this version of the connector, or is there anything else I should check or configure?

Thank you.

netstat -ano |findstr "8091"

 

 

when I run the program I get this

 

after a quick second i am able to get to the site it will stop

 

 

Universal Print Connector

1 Reply

  • Charlie34000's avatar
    Charlie34000
    MCT
    Apr 03, 2026

    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 urlacl

    Look 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.