Sonarr won't launch browser from systray

Sonarr version (exact version): 2.0.0.5054
OS: Windows 10
Description of issue: Since I reinstalled my browser (Firefox), I can no longer launch Sonarr in the browser from the systray icon. The error in the log is:

Couldn't open default browser to http://localhost:8989: The request is not supported

Going to localhost:8989 in the browser works fine, and all other programs that open web pages appear to be working fine (apart from Radarr, which gives the same error). All that’s missing is the ability to launch Sonarr from its systray icon.

Am I missing something obvious?

Is that error logged in the file or just the UI? If it’s in the logs, please post the full ((debug log)) file.

Sonarr tells windows to open the URL, which Windows uses the default browser to do so, resetting the default browser would be a good first step.

Here’s the full debug log, when all I did was start Sonarr and then select “Launch Browser” from the systray menu:

17-11-17 15:33:43.0|Debug|ProcessProvider|Found 0 processes with the name: NzbDrone.Console
17-11-17 15:33:43.1|Debug|ProcessProvider|Found 1 processes with the name: NzbDrone
17-11-17 15:33:43.1|Debug|ProcessProvider| - [12752] NzbDrone
17-11-17 15:33:43.1|Info|Router|Application mode: Interactive
17-11-17 15:33:43.1|Debug|Router|Tray selected
17-11-17 15:33:43.3|Info|MigrationLogger|*** Migrating data source=C:\ProgramData\NzbDrone\nzbdrone.db;cache size=-10485760;datetimekind=Utc;journal mode=Wal;pooling=True;version=3 ***
17-11-17 15:33:43.6|Debug|MigrationLogger|Took: 00:00:00.2676157
17-11-17 15:33:43.6|Info|MigrationLogger|*** Migrating data source=C:\ProgramData\NzbDrone\logs.db;cache size=-10485760;datetimekind=Utc;journal mode=Wal;pooling=True;version=3 ***
17-11-17 15:33:43.6|Debug|MigrationLogger|Took: 00:00:00.0233534
17-11-17 15:33:43.8|Debug|netsh.exe|Starting netsh.exe http show urlacl
17-11-17 15:33:44.1|Debug|netsh.exe|URL Reservations: 
17-11-17 15:33:44.2|Debug|netsh.exe|----------------- 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : http://*:5357/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: BUILTIN\Users
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT AUTHORITY\LOCAL SERVICE
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;BU)(A;;GX;;;LS) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : http://+:80/Temporary_Listen_Addresses/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : https://*:5358/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: BUILTIN\Users
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT AUTHORITY\LOCAL SERVICE
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;BU)(A;;GX;;;LS) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : https://+:443/sra_{BA195980-CD49-458b-9E23-C84EE0ADCD75}/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT SERVICE\SstpSvc
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|        User: BUILTIN\Administrators
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT AUTHORITY\SYSTEM
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GA;;;S-1-5-80-3435701886-799518250-3791383489-3228296122-2938884314)(A;;GA;;;BA)(A;;GA;;;SY) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : http://*:2869/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT AUTHORITY\LOCAL SERVICE
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;LS) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : http://+:80/0131501b-d67f-491b-9a40-c4bf27bcb4d4/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT AUTHORITY\NETWORK SERVICE
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;NS) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : https://+:443/C574AC30-5794-4AEE-B1BB-6651C5315029/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT AUTHORITY\NETWORK SERVICE
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;NS) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : http://+:80/116B50EB-ECE2-41ac-8429-9F9E963361B7/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT AUTHORITY\NETWORK SERVICE
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;NS) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : https://+:10245/WMPNSSv4/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT SERVICE\WMPNetworkSvc
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;S-1-5-80-2375682873-768044350-3534595160-1005545032-2873800392) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : http://+:10243/WMPNSSv4/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT SERVICE\WMPNetworkSvc
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;S-1-5-80-2375682873-768044350-3534595160-1005545032-2873800392) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : http://+:10246/MDEServer/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT AUTHORITY\Authenticated Users
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;AU) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : https://+:5986/wsman/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT SERVICE\WinRM
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT SERVICE\Wecsvc
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;S-1-5-80-569256582-2953403351-2909559716-1301513147-412116970)(A;;GX;;;S-1-5-80-4059739203-877974739-1245631912-527174227-2996563517) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : http://+:47001/wsman/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT SERVICE\WinRM
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT SERVICE\Wecsvc
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;S-1-5-80-569256582-2953403351-2909559716-1301513147-412116970)(A;;GX;;;S-1-5-80-4059739203-877974739-1245631912-527174227-2996563517) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : http://+:5985/wsman/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT SERVICE\WinRM
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|        User: NT SERVICE\Wecsvc
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;S-1-5-80-569256582-2953403351-2909559716-1301513147-412116970)(A;;GX;;;S-1-5-80-4059739203-877974739-1245631912-527174227-2996563517) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : http://+:9007/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : http://*:2861/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : http://*:2862/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : http://*:2863/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : http://*:2864/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.2|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.2|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.2|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.2|Debug|netsh.exe|    Reserved URL            : http://*:2865/ 
17-11-17 15:33:44.2|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2866/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2867/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2868/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2870/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2871/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2872/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2873/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2874/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2875/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2876/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2877/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2878/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2879/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2880/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2881/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2882/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2883/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2884/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2885/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2886/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2887/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2888/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2889/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:2890/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://+:10247/apps/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: NT AUTHORITY\Authenticated Users
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;AU) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:8989/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://127.0.0.1:9117/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://localhost:9117/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.3|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.3|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.3|Debug|netsh.exe|    Reserved URL            : http://*:7878/ 
17-11-17 15:33:44.3|Debug|netsh.exe|        User: \Everyone
17-11-17 15:33:44.3|Debug|netsh.exe|            Listen: Yes
17-11-17 15:33:44.4|Debug|netsh.exe|            Delegate: No
17-11-17 15:33:44.4|Debug|netsh.exe|            SDDL: D:(A;;GX;;;WD) 
17-11-17 15:33:44.4|Info|OwinHostController|Listening on the following URLs:
17-11-17 15:33:44.4|Info|OwinHostController|  http://*:8989/
17-11-17 15:33:44.5|Debug|OwinAppFactory|Attaching NzbDroneVersionMiddleWare to host
17-11-17 15:33:44.6|Debug|OwinAppFactory|Attaching SignalRMiddleWare to host
17-11-17 15:33:44.6|Debug|OwinAppFactory|Attaching NancyMiddleWare to host
17-11-17 15:33:44.7|Info|NancyBootstrapper|Starting Web Server
17-11-17 15:33:45.7|Debug|QualityDefinitionService|Setting up default quality config
17-11-17 15:33:46.1|Debug|NotificationFactory|Initializing Providers. Count 20
17-11-17 15:33:46.5|Debug|IndexerFactory|Initializing Providers. Count 12
17-11-17 15:33:46.6|Debug|MetadataFactory|Initializing Providers. Count 4
17-11-17 15:33:46.6|Debug|DownloadClientFactory|Initializing Providers. Count 15
17-11-17 15:33:46.9|Debug|QBittorrentProxy|qBittorrent authentication succeeded.
17-11-17 15:33:52.6|Info|BrowserService|Starting default browser. http://localhost:8989
17-11-17 15:33:52.6|Info|ProcessProvider|Opening URL [http://localhost:8989]
17-11-17 15:33:52.7|Error|BrowserService|Couldn't open default browser to http://localhost:8989

[v2.0.0.5054] System.ComponentModel.Win32Exception (0x80004005): The request is not supported
   at System.Diagnostics.Process.StartWithShellExecuteEx(ProcessStartInfo startInfo)
   at System.Diagnostics.Process.Start()
   at NzbDrone.Common.Processes.ProcessProvider.OpenDefaultBrowser(String url) in M:\BuildAgent\work\b69c1fe19bfc2c38\src\NzbDrone.Common\Processes\ProcessProvider.cs:line 107
   at NzbDrone.Host.BrowserService.LaunchWebUI() in M:\BuildAgent\work\b69c1fe19bfc2c38\src\NzbDrone.Host\BrowserService.cs:line 37

The default browser is failing to open when Sonarr attempts to start the process. Have you tried to reset the default browser?

Yes, I tried that a few times before posting here, but it made no difference.

FWIW, I have managed to solve the problem by reinstalling Sonarr - although I ran a file comparison against a copy of the previous installation and couldn’t find any difference. I guess it was just one of those annoying idiosyncrasies that we Windows users run up against once in a while. (And probably also related to the massive changes in the new version of Firefox.) All working again now, anyway.

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