Hi,

Didn't notice this before. Pretty recent snapshot:

OpenBSD 7.8-current (GENERIC.MP) #254: Mon Feb 23 17:43:38 MST 2026
    deraadt@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP

$ id
uid=847(_iperf3) gid=847(_iperf3) groups=847(_iperf3)

$ /usr/local/bin/iperf3 -s
pledge !needwr: Invalid argument

Initially noticed via:

# rcctl check iperf3
iperf3(failed)

-- 
Regards,
 nvalid argument
Mikol: