Bug 1888465 - Default install of F33 10/13/20, fails to bind to ipv4 interface
Summary: Default install of F33 10/13/20, fails to bind to ipv4 interface
Alias: None
Product: Fedora
Classification: Fedora
Component: cockpit
Version: 33
Hardware: aarch64
OS: Unspecified
Target Milestone: ---
Assignee: Martin Pitt
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2020-10-14 22:08 UTC by Jeremy Linton
Modified: 2020-10-15 16:03 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
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Clone Of:
Last Closed: 2020-10-15 16:03:36 UTC
Type: Bug

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Description Jeremy Linton 2020-10-14 22:08:05 UTC
Description of problem: Clean install of F33 snapshot from 10/13/20 on a honeycomb (NXP 16 core aarch64/A72). Initial login says:

"web console: https://localhost:9090/ or"

The latter doesn't work because the cockpit.socket appears to only be binding ipv6.

[root@mammon-honey-f33 ~]# ip addr |grep inet
    inet scope host lo
    inet6 ::1/128 scope host 
    inet brd scope global dynamic noprefixroute eth0
    inet6 fe80::250:b6ff:feea:93b7/64 scope link noprefixroute 

[root@mammon-honey-f33 ~]# netstat -a |grep websm
tcp6       0      0 [::]:websm              [::]:*                  LISTEN     

Version-Release number of selected component (if applicable):

How reproducible: 100%

Steps to Reproduce:
1. Install F33 Server edition.

Actual results:
2. [root@mammon-honey-f33 ~]# wget https://[::1]:9090
--2020-10-14 17:02:00--  https://[::1]:9090/
Connecting to [::1]:9090... connected.
ERROR: The certificate of ‘::1’ is not trusted.
ERROR: The certificate of ‘::1’ doesn't have a known issuer.
The certificate's owner does not match hostname ‘::1’
3. [root@mammon-honey-f33 ~]# wget
--2020-10-14 17:02:20--
Connecting to failed: Connection refused.

Expected results:

The second case connects.

Looks like this is probably a systemd issue, but I don't see the systemd flags in any of the unit files to only bind ipv6..

Comment 1 Jeremy Linton 2020-10-14 22:15:44 UTC
This might be useful:
[root@mammon-honey-f33 etc]# cat /proc/sys/net/ipv6/bindv6only
[root@mammon-honey-f33 etc]# systemctl status cockpit.socket |grep List
     Listen: [::]:9090 (Stream)

Comment 2 Martin Pitt 2020-10-15 05:05:57 UTC
There might be something wrong with the firewall. A default install uses firewalld. Do you see cockpit in `firewall-cmd --list-services`? For me, I can't connect with either IPv4 or IPv6 if it's disabled, and after `firewall-cmd --add-service cockpit` I can connect with both 4 and 6.

Does connecting to work? That's the equivalent of ::1. Your address is one from an external interface.

Can you try after "systemctl stop firewalld"? (Don't forget to re-enable it afterwards).

Next step would be to peel off the systemd activation layer:

    systemctl stop cockpit.socket cockpit
and try the absolutely simplest case:

    su -s /bin/sh -c '/usr/libexec/cockpit-ws --no-tls' cockpit-wsinstance

Does any of that work?

Comment 3 Jeremy Linton 2020-10-15 16:03:23 UTC
Ah, yah realized I was using the ipv4 addr above rather than the ipv4 loopback. Yes the loopback works, so its not strictly ipv4.

Turns out it was a combination of firewalling (not just the fedora's) and a bit of fat fingering IP's as seen above. 

I'm going to kill this because, I thought it was some kind of socket binding problem and it was 99% PEBCAK.

Thanks, and sorry for the noise.

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