I also got these errors:

Jan 22 21:14:15 cine transmission-daemon[7770]: [2018-01-22 21:14:15.631 PST] 
UDP Failed to set receive buffer: requested 4194304, got 327680 (tr-udp.c:78)
Jan 22 21:14:15 cine transmission-daemon[7770]: [2018-01-22 21:14:15.631 PST] 
UDP Failed to set send buffer: requested 1048576, got 327680 (tr-udp.c:89)

Which I resolved by setting

net.core.rmem_max = 4194304
net.core.wmem_max = 1048576

in /etc/sysctl.conf

and running

sudo sysctl -p

But I am still unable to use the webui.

** Description changed:

  I just upgraded to transmission-daemon 2.84-3ubuntu3.1 and I can no
- longer use the webui (or android clients) to access transmission.
+ longer use the webui (nor android clients) to access transmission. This
+ is the webui URL I've been using:
+ 
+ http://cine:9091/transmission/web/
+ 
+ This is the error I'm getting:
+ 
+ Connection Failed
+ Could not connect to the server. You may need to reload the page to reconnect.
+ 
  transmission-remote on the machine works fine. The server running
  transmission-daemon is on a local network on the same subnet as the
- android and webui clients.
+ android and webui clients. Nothing has changed beyond installing a few
+ updates, including 2.84-3.
  
  Here is my settings.json:
  
  {
-     "alt-speed-down": 15, 
-     "alt-speed-enabled": false, 
-     "alt-speed-time-begin": 540, 
-     "alt-speed-time-day": 127, 
-     "alt-speed-time-enabled": false, 
-     "alt-speed-time-end": 1020, 
-     "alt-speed-up": 15, 
-     "bind-address-ipv4": "0.0.0.0", 
-     "bind-address-ipv6": "::", 
-     "blocklist-date": 1308104247, 
-     "blocklist-enabled": true, 
-     "blocklist-updates-enabled": true, 
-     "blocklist-url": "http://john.bitsurge.net/public/biglist.p2p.gz";, 
-     "cache-size-mb": 4, 
-     "compact-view": false, 
-     "dht-enabled": true, 
-     "download-dir": "/home/bbogart/Downloads", 
-     "download-queue-enabled": true, 
-     "download-queue-size": 5, 
-     "encryption": 1, 
-     "filter-mode": "show-all", 
-     "idle-seeding-limit": 30, 
-     "idle-seeding-limit-enabled": false, 
-     "incomplete-dir": "/home/bbogart/Downloads", 
-     "incomplete-dir-enabled": false, 
-     "inhibit-desktop-hibernation": true, 
-     "lazy-bitfield-enabled": true, 
-     "lpd-enabled": false, 
-     "main-window-height": 975, 
-     "main-window-is-maximized": 0, 
-     "main-window-layout-order": "menu,toolbar,filter,list,statusbar", 
-     "main-window-width": 968, 
-     "main-window-x": 285, 
-     "main-window-y": 0, 
-     "message-level": 1, 
-     "minimal-view": false, 
-     "open-dialog-dir": "/home/bbogart", 
-     "open-file-limit": 32, 
-     "peer-congestion-algorithm": "", 
-     "peer-id-ttl-hours": 6, 
-     "peer-limit-global": 240, 
-     "peer-limit-per-torrent": 60, 
-     "peer-port": 60639, 
-     "peer-port-random-high": 65535, 
-     "peer-port-random-low": 49152, 
-     "peer-port-random-on-start": true, 
-     "peer-socket-tos": "default", 
-     "pex-enabled": true, 
-     "play-download-complete-sound": false, 
-     "port-forwarding-enabled": true, 
-     "preallocation": 1, 
-     "prefetch-enabled": 1, 
-     "prompt-before-exit": true, 
-     "proxy": "", 
-     "proxy-auth-enabled": false, 
-     "proxy-auth-password": "", 
-     "proxy-auth-username": "", 
-     "proxy-enabled": false, 
-     "proxy-port": 80, 
-     "proxy-type": 0, 
-     "queue-stalled-enabled": true, 
-     "queue-stalled-minutes": 30, 
-     "ratio-limit": 1.2496, 
-     "ratio-limit-enabled": true, 
-     "recent-download-dir-1": "/home/bbogart/Downloads", 
-     "rename-partial-files": false, 
-     "rpc-authentication-required": false, 
-     "rpc-bind-address": "0.0.0.0", 
-     "rpc-enabled": true, 
-     "rpc-host-whitelist": "", 
-     "rpc-host-whitelist-enabled": true, 
-     "rpc-password": "{e607e2c7c28eab2770c82c1d0574c0e731c050d5TdP8HGP6", 
-     "rpc-port": 9091, 
-     "rpc-url": "/transmission/", 
-     "rpc-username": "", 
-     "rpc-whitelist": "192.168.0.*", 
-     "rpc-whitelist-enabled": false, 
-     "scrape-paused-torrents-enabled": true, 
-     "script-torrent-done-enabled": false, 
-     "script-torrent-done-filename": "/home/bbogart", 
-     "seed-queue-enabled": false, 
-     "seed-queue-size": 10, 
-     "show-backup-trackers": false, 
-     "show-desktop-notification": true, 
-     "show-extra-peer-details": false, 
-     "show-filterbar": true, 
-     "show-notification-area-icon": true, 
-     "show-options-window": true, 
-     "show-statusbar": true, 
-     "show-toolbar": true, 
-     "show-tracker-scrapes": false, 
-     "sort-mode": "sort-by-ratio", 
-     "sort-reversed": false, 
-     "speed-limit-down": 100, 
-     "speed-limit-down-enabled": false, 
-     "speed-limit-up": 100, 
-     "speed-limit-up-enabled": false, 
-     "start-added-torrents": true, 
-     "statusbar-stats": "total-ratio", 
-     "torrent-added-notification-enabled": false, 
-     "torrent-complete-notification-enabled": true, 
-     "torrent-complete-sound-command": "canberra-gtk-play -i complete-download 
-d 'transmission torrent downloaded'", 
-     "torrent-complete-sound-enabled": false, 
-     "trash-can-enabled": true, 
-     "trash-original-torrent-files": false, 
-     "umask": 0, 
-     "upload-slots-per-torrent": 14, 
-     "user-has-given-informed-consent": true, 
-     "utp-enabled": true, 
-     "watch-dir": "/home/bbogart/Downloads", 
-     "watch-dir-enabled": false
+     "alt-speed-down": 15,
+     "alt-speed-enabled": false,
+     "alt-speed-time-begin": 540,
+     "alt-speed-time-day": 127,
+     "alt-speed-time-enabled": false,
+     "alt-speed-time-end": 1020,
+     "alt-speed-up": 15,
+     "bind-address-ipv4": "0.0.0.0",
+     "bind-address-ipv6": "::",
+     "blocklist-date": 1308104247,
+     "blocklist-enabled": true,
+     "blocklist-updates-enabled": true,
+     "blocklist-url": "http://john.bitsurge.net/public/biglist.p2p.gz";,
+     "cache-size-mb": 4,
+     "compact-view": false,
+     "dht-enabled": true,
+     "download-dir": "/home/bbogart/Downloads",
+     "download-queue-enabled": true,
+     "download-queue-size": 5,
+     "encryption": 1,
+     "filter-mode": "show-all",
+     "idle-seeding-limit": 30,
+     "idle-seeding-limit-enabled": false,
+     "incomplete-dir": "/home/bbogart/Downloads",
+     "incomplete-dir-enabled": false,
+     "inhibit-desktop-hibernation": true,
+     "lazy-bitfield-enabled": true,
+     "lpd-enabled": false,
+     "main-window-height": 975,
+     "main-window-is-maximized": 0,
+     "main-window-layout-order": "menu,toolbar,filter,list,statusbar",
+     "main-window-width": 968,
+     "main-window-x": 285,
+     "main-window-y": 0,
+     "message-level": 1,
+     "minimal-view": false,
+     "open-dialog-dir": "/home/bbogart",
+     "open-file-limit": 32,
+     "peer-congestion-algorithm": "",
+     "peer-id-ttl-hours": 6,
+     "peer-limit-global": 240,
+     "peer-limit-per-torrent": 60,
+     "peer-port": 60639,
+     "peer-port-random-high": 65535,
+     "peer-port-random-low": 49152,
+     "peer-port-random-on-start": true,
+     "peer-socket-tos": "default",
+     "pex-enabled": true,
+     "play-download-complete-sound": false,
+     "port-forwarding-enabled": true,
+     "preallocation": 1,
+     "prefetch-enabled": 1,
+     "prompt-before-exit": true,
+     "proxy": "",
+     "proxy-auth-enabled": false,
+     "proxy-auth-password": "",
+     "proxy-auth-username": "",
+     "proxy-enabled": false,
+     "proxy-port": 80,
+     "proxy-type": 0,
+     "queue-stalled-enabled": true,
+     "queue-stalled-minutes": 30,
+     "ratio-limit": 1.2496,
+     "ratio-limit-enabled": true,
+     "recent-download-dir-1": "/home/bbogart/Downloads",
+     "rename-partial-files": false,
+     "rpc-authentication-required": false,
+     "rpc-bind-address": "0.0.0.0",
+     "rpc-enabled": true,
+     "rpc-host-whitelist": "",
+     "rpc-host-whitelist-enabled": true,
+     "rpc-password": "{e607e2c7c28eab2770c82c1d0574c0e731c050d5TdP8HGP6",
+     "rpc-port": 9091,
+     "rpc-url": "/transmission/",
+     "rpc-username": "",
+     "rpc-whitelist": "192.168.0.*",
+     "rpc-whitelist-enabled": false,
+     "scrape-paused-torrents-enabled": true,
+     "script-torrent-done-enabled": false,
+     "script-torrent-done-filename": "/home/bbogart",
+     "seed-queue-enabled": false,
+     "seed-queue-size": 10,
+     "show-backup-trackers": false,
+     "show-desktop-notification": true,
+     "show-extra-peer-details": false,
+     "show-filterbar": true,
+     "show-notification-area-icon": true,
+     "show-options-window": true,
+     "show-statusbar": true,
+     "show-toolbar": true,
+     "show-tracker-scrapes": false,
+     "sort-mode": "sort-by-ratio",
+     "sort-reversed": false,
+     "speed-limit-down": 100,
+     "speed-limit-down-enabled": false,
+     "speed-limit-up": 100,
+     "speed-limit-up-enabled": false,
+     "start-added-torrents": true,
+     "statusbar-stats": "total-ratio",
+     "torrent-added-notification-enabled": false,
+     "torrent-complete-notification-enabled": true,
+     "torrent-complete-sound-command": "canberra-gtk-play -i complete-download 
-d 'transmission torrent downloaded'",
+     "torrent-complete-sound-enabled": false,
+     "trash-can-enabled": true,
+     "trash-original-torrent-files": false,
+     "umask": 0,
+     "upload-slots-per-torrent": 14,
+     "user-has-given-informed-consent": true,
+     "utp-enabled": true,
+     "watch-dir": "/home/bbogart/Downloads",
+     "watch-dir-enabled": false
  }

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to transmission in Ubuntu.
https://bugs.launchpad.net/bugs/1744855

Title:
  Upgrade to 2.84-3ubuntu3.1 breaks remote access (webui)

Status in transmission package in Ubuntu:
  New

Bug description:
  I just upgraded to transmission-daemon 2.84-3ubuntu3.1 and I can no
  longer use the webui (nor android clients) to access transmission.
  This is the webui URL I've been using:

  http://cine:9091/transmission/web/

  This is the error I'm getting:

  Connection Failed
  Could not connect to the server. You may need to reload the page to reconnect.

  transmission-remote on the machine works fine. The server running
  transmission-daemon is on a local network on the same subnet as the
  android and webui clients. Nothing has changed beyond installing a few
  updates, including 2.84-3.

  Here is my settings.json:

  {
      "alt-speed-down": 15,
      "alt-speed-enabled": false,
      "alt-speed-time-begin": 540,
      "alt-speed-time-day": 127,
      "alt-speed-time-enabled": false,
      "alt-speed-time-end": 1020,
      "alt-speed-up": 15,
      "bind-address-ipv4": "0.0.0.0",
      "bind-address-ipv6": "::",
      "blocklist-date": 1308104247,
      "blocklist-enabled": true,
      "blocklist-updates-enabled": true,
      "blocklist-url": "http://john.bitsurge.net/public/biglist.p2p.gz";,
      "cache-size-mb": 4,
      "compact-view": false,
      "dht-enabled": true,
      "download-dir": "/home/bbogart/Downloads",
      "download-queue-enabled": true,
      "download-queue-size": 5,
      "encryption": 1,
      "filter-mode": "show-all",
      "idle-seeding-limit": 30,
      "idle-seeding-limit-enabled": false,
      "incomplete-dir": "/home/bbogart/Downloads",
      "incomplete-dir-enabled": false,
      "inhibit-desktop-hibernation": true,
      "lazy-bitfield-enabled": true,
      "lpd-enabled": false,
      "main-window-height": 975,
      "main-window-is-maximized": 0,
      "main-window-layout-order": "menu,toolbar,filter,list,statusbar",
      "main-window-width": 968,
      "main-window-x": 285,
      "main-window-y": 0,
      "message-level": 1,
      "minimal-view": false,
      "open-dialog-dir": "/home/bbogart",
      "open-file-limit": 32,
      "peer-congestion-algorithm": "",
      "peer-id-ttl-hours": 6,
      "peer-limit-global": 240,
      "peer-limit-per-torrent": 60,
      "peer-port": 60639,
      "peer-port-random-high": 65535,
      "peer-port-random-low": 49152,
      "peer-port-random-on-start": true,
      "peer-socket-tos": "default",
      "pex-enabled": true,
      "play-download-complete-sound": false,
      "port-forwarding-enabled": true,
      "preallocation": 1,
      "prefetch-enabled": 1,
      "prompt-before-exit": true,
      "proxy": "",
      "proxy-auth-enabled": false,
      "proxy-auth-password": "",
      "proxy-auth-username": "",
      "proxy-enabled": false,
      "proxy-port": 80,
      "proxy-type": 0,
      "queue-stalled-enabled": true,
      "queue-stalled-minutes": 30,
      "ratio-limit": 1.2496,
      "ratio-limit-enabled": true,
      "recent-download-dir-1": "/home/bbogart/Downloads",
      "rename-partial-files": false,
      "rpc-authentication-required": false,
      "rpc-bind-address": "0.0.0.0",
      "rpc-enabled": true,
      "rpc-host-whitelist": "",
      "rpc-host-whitelist-enabled": true,
      "rpc-password": "{e607e2c7c28eab2770c82c1d0574c0e731c050d5TdP8HGP6",
      "rpc-port": 9091,
      "rpc-url": "/transmission/",
      "rpc-username": "",
      "rpc-whitelist": "192.168.0.*",
      "rpc-whitelist-enabled": false,
      "scrape-paused-torrents-enabled": true,
      "script-torrent-done-enabled": false,
      "script-torrent-done-filename": "/home/bbogart",
      "seed-queue-enabled": false,
      "seed-queue-size": 10,
      "show-backup-trackers": false,
      "show-desktop-notification": true,
      "show-extra-peer-details": false,
      "show-filterbar": true,
      "show-notification-area-icon": true,
      "show-options-window": true,
      "show-statusbar": true,
      "show-toolbar": true,
      "show-tracker-scrapes": false,
      "sort-mode": "sort-by-ratio",
      "sort-reversed": false,
      "speed-limit-down": 100,
      "speed-limit-down-enabled": false,
      "speed-limit-up": 100,
      "speed-limit-up-enabled": false,
      "start-added-torrents": true,
      "statusbar-stats": "total-ratio",
      "torrent-added-notification-enabled": false,
      "torrent-complete-notification-enabled": true,
      "torrent-complete-sound-command": "canberra-gtk-play -i complete-download 
-d 'transmission torrent downloaded'",
      "torrent-complete-sound-enabled": false,
      "trash-can-enabled": true,
      "trash-original-torrent-files": false,
      "umask": 0,
      "upload-slots-per-torrent": 14,
      "user-has-given-informed-consent": true,
      "utp-enabled": true,
      "watch-dir": "/home/bbogart/Downloads",
      "watch-dir-enabled": false
  }

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