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README: avahi Troubleshooting: add a NixOS-specific tip.

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F. Duncanh
2024-09-14 12:12:34 -04:00
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README.md
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@@ -1002,8 +1002,10 @@ Some systems may instead use the mdnsd daemon as an alternative to provide DNS
If UxPlay stops with the "No DNS-SD Server found" message, this means that your network **does not have a running Bonjour/zeroconf DNS-SD server.**
Before v1.60, UxPlay used to stall silently if DNS-SD service registration failed, but now stops with an error message returned by the
DNSServiceRegister function: kDNSServiceErr_Unknown if no DNS-SD server was found:
other mDNS error codes are in the range FFFE FF00 (-65792) to FFFE FFFF (-65537), and are listed in the
DNSServiceRegister function: kDNSServiceErr_Unknown if no DNS-SD server was found.
(A NixOS user found that in NixOS, this error can also occur if avahi-daemon service IS running with publishing enabled,
but reports "the error disappeared on NixOS by setting services.avahi.openFirewall to true".)
Other mDNS error codes are in the range FFFE FF00 (-65792) to FFFE FFFF (-65537), and are listed in the
dnssd.h file. An older version of this (the one used by avahi) is found [here](https://github.com/lathiat/avahi/blob/master/avahi-compat-libdns_sd/dns_sd.h).
A few additional error codes are defined in a later version
from [Apple](https://opensource.apple.com/source/mDNSResponder/mDNSResponder-544/mDNSShared/dns_sd.h.auto.html).