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When a process except cupsd uses the port 631, Samba which enables CUPS can't boot. #1535
I find a problem about the CUPS function of Samba.
When the cups daemon doesn't work and the port 631 is used by another process, the smbd which enables the CUPS function can't boot.
Even if the port 631 has already used by another process, the smbd connects to the 631 port for the initialisation of CUPS.
Because the current implementation of cupsDoRequest() doesn't have any timeout mechanism, it may be difficult to avoid this situation.
I filed this problem to a Bugzilla of Samba.