Bug 415968

Summary: Dolphin freezes if all outgoing traffic is blocked through iptables
Product: [Applications] dolphin Reporter: ITicDigger
Component: generalAssignee: Dolphin Bug Assignee <dolphin-bugs-null>
Status: REPORTED ---    
Severity: normal CC: dolphin-bugs-null, miranda
Priority: NOR    
Version First Reported In: 19.04.3   
Target Milestone: ---   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description ITicDigger 2020-01-07 15:31:13 UTC 
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.
Comment 1 Christoph Feck 2020-01-07 19:05:32 UTC 
What happens if you access these "blocked" network shares from Konsole, e.g. using "ls" or "dir" command?
Comment 2 ITicDigger 2020-01-07 19:10:19 UTC 
(In reply to Christoph Feck from comment #1)
> What happens if you access these "blocked" network shares from Konsole, e.g.
> using "ls" or "dir" command?

You did not understand. Not network shares hang. The WHOLE DOLPHIN hangs. I’m not trying to access network shares (this is impossible, because I blocked the network). I am trying to open a regular partition of my regular hard drive.