Public bug reported:
Ubuntu version: 24.04
Package version: 2.3.4-1
What you expected to happen: miniupnpd would accept requests and add nftables
rules as configured
What happened instead: miniupnpd received requests, but was unable to add
nftables rules
By default, the systemd unit file for miniupnpd has set TasksMax=2, which
causes the following errors:
/usr/libexec/miniupnpd-startstop-helper.sh: 32: Cannot fork
/usr/libexec/miniupnpd-startstop-helper.sh: 13: Cannot fork
Warning: no interface defined
This in turn results in miniupnpd being unable to save any rules to nftables,
and therefore unable to forward any ports, with the following errors appearing
whenever any requests come in:
send_batch: mnl_cb_run returned -1
nft_send_rule([redacted]) send_batch failed -4
Failed to redirect [redacted]
Failed to add NAT-PMP [redacted]
Luckily the fix is very simple, TasksMax just needs to be set to a
higher value in the systemd unit file. I've created an override on mine
to TasksMax=10, and had good results so far.
** Affects: miniupnpd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2092533
Title:
TasksMax set too low, miniupnpd-startstop-helper.sh cannot fork
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