[Bug 2044572] [NEW] NetworkManager plugin NeedSecrets takes time to become operational after wake

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For fully and correctly operational NetworkManager VPN configuration(s)
with no unresolved issues, misconfigurations, or connectivity/networking
problems, there is a recurring problem (observed from 18.04 through
23.04) where the functionality of the NeedSecrets plugin (which stores
saved-per-user credentials for a VPN connection/profile) is unavailable
immediately following the wake of a PC from suspension.

After waiting "long enough" (more than a couple of minutes) and then
retrying to use a NetworkManager profile with a saved per-user secret,
the secret is correctly obtained allowing the connection to be
established.

This seems to be dependent on the level of suspend; in my test case,
merely hitting the power/suspend button on the device (an HP ZBook G3
Studio), waiting for the screen to go out, then re-waking the device
does not trigger this behavior; however closing the lid of the device,
letting it go into "full" suspension, then waking it some time later
reliably reproduces this issue.

When the issue described presents, the following is logged to the system
journal:

    Nov 24 12:37:17 ZBook NetworkManager[642]: <warn>  [1700851037.6714]
vpn[0x55b0c2acc7c0,109e3fe6-11a2-4587-bdfa-3071cb52fb36,"example.net"]:
plugin NeedSecrets request #1 failed: Timeout was reached

With the default configuration, no other messages regarding NeedSecrets
are logged to the system journal.

I took care to ensure the network was fully operational before
attempting to establish the VPN connection via NetworkManager; full
TCP/IP connectivity and DNS resolution was confirmed working before the
VPN attempt was made and the NeedSecrets warning was logged.

As mentioned, this has been observed at least since 18.04 and currently
against Ubuntu 23.04. The following network-manager packages/versions
are installed:

* network-manager-config-connectivity-ubuntu/lunar,now 1.42.4-1ubuntu2 all [installed,automatic]
* network-manager-gnome/lunar,now 1.30.0-2ubuntu1 amd64 [installed,automatic]
* network-manager-l2tp-gnome/lunar,now 1.20.8-1 amd64 [installed]
* network-manager-l2tp/lunar,now 1.20.8-1 amd64 [installed,automatic]
* network-manager-openvpn-gnome/lunar,now 1.10.2-2 amd64 [installed]
* network-manager-openvpn/lunar,now 1.10.2-2 amd64 [installed]
* network-manager-pptp-gnome/lunar,now 1.2.12-1 amd64 [installed,automatic]
* network-manager-pptp/lunar,now 1.2.12-1 amd64 [installed,automatic]
* network-manager-strongswan/lunar,now 1.6.0-1 amd64 [installed]
* network-manager-vpnc-gnome/lunar,now 1.2.8-4 amd64 [installed]
* network-manager-vpnc/lunar,now 1.2.8-4 amd64 [installed]
* network-manager/lunar,now 1.42.4-1ubuntu2 amd64 [installed,automatic]

** Affects: network-manager
     Importance: Undecided
         Status: New

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NetworkManager plugin NeedSecrets takes time to become operational after wake
https://bugs.launchpad.net/bugs/2044572
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