Netcat not working with localhost

[Rich Walsh]

Is this a Tahoe thing, or have I forgotten how to do everything today? This won’t work for me anymore:

do shell script "echo '/go' | nc -u -w 0 localhost 53535"

I have to force IPv4 now:

do shell script "echo '/go' | nc -4 -u -w 0 localhost 53535"

I can also use an explicit IP address such as 127.0.0.1, or the ones listed in the OSC Access settings.

Thanks.

Rich

[Paul]

I've got the same thing on 13.7.8 Ventura, now have to use

do shell script "echo '/go' | nc -4 -u -w0 localhost 53535"

looks like netcat now default to IPv6  so need to explicitly specify v4;  I guess it's a recent update.

[Rich Walsh]

Strange that it should suddenly start impacting Ventura (macOS 13) when that is relatively old and I think this technique worked on Sequoia (macOS 15) last time I tested it. Research suggests that Apple have been pushing for IPv6 to be preferred over IPv4 for quite a while, but I can’t find a decisive update that would have broken this behaviour for multiple OS versions.

Could it be that QLab has stopped listening on IPv6? Maybe it never has?

It’s an annoying silent failure to be aware of when dusting off old code that used to work! Maybe 127.0.0.1 would have been a better destination all along. I think I’ll switch to that from now on.

Rich

[Chris Ashworth]

That’s correct — QLab doesn’t listen on IPv6.

-C

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