[dolphin] [Bug 415968] New: Dolphin freezes if all outgoing traffic is blocked through iptables

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=415968

            Bug ID: 415968
           Summary: Dolphin freezes if all outgoing traffic is blocked
                    through iptables
           Product: dolphin
           Version: 19.04.3
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: critical
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: ITicDigger at disroot.org
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
If you block all outgoing traffic using iptables, then the Dolphin file manager
will work normally only in the user's home directory. When you try to open
another disk partition, it will freeze completely.

STEPS TO REPRODUCE
1. create a iptables-rule: sudo iptables -I OUTPUT -m owner --uid-owner
myusername -j DROP
2. open Dolphin
3. try click on some of volumes in left panel

OBSERVED RESULT
Dolphin freezes

EXPECTED RESULT
Dolphin should open the section and show its contents

SOFTWARE/OS VERSIONS
Windows: 
Linux/KDE Plasma: Ubuntu Studio 19 with last updates and Kubuntu 18 with last
updates

ADDITIONAL INFORMATION
The same behavior is observed for the Dolphin version 17.12.3.
Interestingly, having real access to the network does not affect the appearance
of this problem. That is, if you disconnect the Internet cable from the PC and
do not create a firewall rule, then Dolphin will work well, but if you turn on
traffic blocking, then a problem will arise with the disconnected and connected
Internet cable.

This is a very big problem. I like Dolphin, but I can’t use it, because I use
network access through the white list of applications.

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