CUPS unable to reserve ports to print to LPD printers in RHEL - Red Hat Customer Portal

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Issue

When we have many users printing at once, CUPS is very slow. In the file /var/log/cups/error_log we repeatedly find the following:
```
E [09/Jul/2013:10:06:00 +0200] [Job 865106] Unable to reserve port: Resource temporarily unavailable
```
Our firewall blocks connections initiated from low-numbered TCP ports (port numberss less than 1024). This is blocking CUPS outgoing LPD (Line Printer Deamon) protocol connections to our printers. What can we do?

Environment

Red Hat Enterprise Linux (RHEL), all versions
Common Unix Printing System (CUPS), all versions

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