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I'm usign Manjaro with XFCE on both machines and the client or server closes automatically if nothing happens for 15 seconds.

Client:

<15> 2019-04-08T15:39:53.768Z runlikehell vncviewer[3031]: LaunchProcess: Launching '/usr/bin/vncviewer' '-child' 'nas:0' '0'
<15> 2019-04-08T15:39:53.865Z runlikehell vncviewer[3031]: AbModuleHosted: AddressBook entered background, pausing syncing
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: TXImage: Using shared memory XImage
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: TXImage: Using default colormap and visual, TrueColor, depth 24.
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: CModuleHosted: CloudConfig.pkg file not found
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: CModuleHosted: Getting CloudConfig.pkg from built-in resource
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: VendorConfig: Reading VendorConfig from configData
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: CModuleHosted: Using business identifier 72c71d3f-1858-4f2a-9729-e04ef8929347
<14> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: CModuleCtrlComms: Listening on /tmp/.vnc-1000/vncviewer.CtrlComms.3035
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: RfbConnection: Peer does not support sync, KeepAlive disabled
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: ProxySettings: Bypass list is localhost,127.0.0.1,localaddress,.localdomain.com
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: ProxySettings: SOCKS proxy is not set
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: ProxySettings: HTTPS proxy is http://10.0.0.101:8118
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: Threading: created   IpResolveThread 0
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: UdpConnector: Starting fallback timer (750 ms)
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: Threading: started   IpResolveThread 7ff5a38b7700
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: IpResolver: Resolved 10.0.0.101::5900
<14> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: CSession: Connecting to nas:0 (Chooser for Direct UDP/Direct TCP via proxy settings)
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: IpResolverIpc: Resolved 10.0.0.101::5900
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: UdpAddrConnector: Trying UDP to 10.0.0.101::5900
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: SocketUtil: Using receive buffer size of 416 KiB
<15> 2019-04-08T15:39:53.873Z runlikehell vncviewer[3031]: Child: 3035: SocketUtil: Using send buffer size of 416 KiB
<15> 2019-04-08T15:39:53.874Z runlikehell vncviewer[3031]: Child: 3035: SctpIo: shutdown complete 0x111f950
<15> 2019-04-08T15:39:53.874Z runlikehell vncviewer[3031]: Child: 3035: UdpAddrConnector: UDP to 10.0.0.101::5900 failed: [System-111] Transport error: recvfrom(): Connection refused (111)
<15> 2019-04-08T15:39:53.874Z runlikehell vncviewer[3031]: Child: 3035: UdpConnector: UDP failed: [System-111] Transport error: recvfrom(): Connection refused (111)
<15> 2019-04-08T15:39:53.874Z runlikehell vncviewer[3031]: Child: 3035: UdpConnector: Trying Direct TCP via proxy settings fallback
<15> 2019-04-08T15:39:53.874Z runlikehell vncviewer[3031]: Child: 3035: ProxyFetcherConnector: Using HTTP CONNECT proxy 10.0.0.101:8118
<15> 2019-04-08T15:39:53.874Z runlikehell vncviewer[3031]: Child: 3035: TcpAddrConnector: Trying TCP to 10.0.0.101::8118
<15> 2019-04-08T15:39:53.877Z runlikehell vncviewer[3031]: Child: 3035: UdpConnector: Connected via Direct TCP via HTTP CONNECT proxy 10.0.0.101:8118 (took 6ms)
<14> 2019-04-08T15:39:53.877Z runlikehell vncviewer[3031]: Child: 3035: CSession: Beginning RFB connection to nas::5900
<14> 2019-04-08T15:39:53.877Z runlikehell vncviewer[3031]: Child: 3035: CSession: Encryption set to 'Server'
<15> 2019-04-08T15:39:54.047Z runlikehell vncviewer[3031]: Child: 3035: CConnection: reading protocol version
<14> 2019-04-08T15:39:54.047Z runlikehell vncviewer[3031]: Child: 3035: CConnection: Server supports RFB protocol version 3.8
<14> 2019-04-08T15:39:54.047Z runlikehell vncviewer[3031]: Child: 3035: CConnection: Using RFB protocol version 3.8
<15> 2019-04-08T15:39:54.047Z runlikehell vncviewer[3031]: Child: 3035: RfbConnection: Peer does not support sync, KeepAlive disabled
<15> 2019-04-08T15:39:54.047Z runlikehell vncviewer[3031]: Child: 3035: CProtoPreV5: processing security types message
<15> 2019-04-08T15:39:54.117Z runlikehell vncviewer[3031]: Child: 3035: CProtoPreV5: processing security types message
<15> 2019-04-08T15:39:54.117Z runlikehell vncviewer[3031]: Child: 3035: CProtoPreV5: Server offers security type VncAuth(2)
<14> 2019-04-08T15:39:54.117Z runlikehell vncviewer[3031]: Child: 3035: CProtoPreV5: Choosing security type VncAuth(2)
<15> 2019-04-08T15:39:54.117Z runlikehell vncviewer[3031]: Child: 3035: CProtoPreV5: processing security message
<15> 2019-04-08T15:39:54.141Z runlikehell vncviewer[3031]: Child: 3035: CProtoPreV5: processing security message
<15> 2019-04-08T15:39:54.141Z runlikehell vncviewer[3031]: Child: 3035: CProtoPreV5: processing security message
<15> 2019-04-08T15:39:56.118Z runlikehell vncviewer[3031]: AbModuleHosted: AddressBook entered foreground, resuming syncing
<15> 2019-04-08T15:39:56.120Z runlikehell vncviewer[3031]: Child: 3035: CProtoPreV5: processing security message
<15> 2019-04-08T15:39:56.120Z runlikehell vncviewer[3031]: Child: 3035: CProtoPreV5: processing security result message
<15> 2019-04-08T15:39:56.121Z runlikehell vncviewer[3031]: AbModuleHosted: AddressBook entered background, pausing syncing
<15> 2019-04-08T15:39:56.226Z runlikehell vncviewer[3031]: Child: 3035: CProtoPreV5: processing security result message
<14> 2019-04-08T15:39:56.226Z runlikehell vncviewer[3031]: Child: 3035: CConnection: Authentication successful
<15> 2019-04-08T15:39:56.226Z runlikehell vncviewer[3031]: Child: 3035: RfbConnection: Enabling extension 'DesktopName' 1
<15> 2019-04-08T15:39:56.226Z runlikehell vncviewer[3031]: Child: 3035: RfbConnection: Enabling extension 'EncodingList' 1
<15> 2019-04-08T15:39:56.226Z runlikehell vncviewer[3031]: Child: 3035: RfbConnection: Enabling extension 'UserAgent' 1
<15> 2019-04-08T15:39:56.226Z runlikehell vncviewer[3031]: Child: 3035: RfbConnection: Enabling extension 'RelPtrCtrl' 1
<15> 2019-04-08T15:39:56.226Z runlikehell vncviewer[3031]: Child: 3035: RfbConnection: Enabling extension 'Printing' 1
<15> 2019-04-08T15:39:56.226Z runlikehell vncviewer[3031]: Child: 3035: RfbConnection: Enabling extension 'FileTransfer' 1
<15> 2019-04-08T15:39:56.226Z runlikehell vncviewer[3031]: Child: 3035: RfbConnection: Enabling extension 'Fops' 1
<15> 2019-04-08T15:39:56.226Z runlikehell vncviewer[3031]: Child: 3035: RfbConnection: Enabling extension 'MStorage' 1
<15> 2019-04-08T15:39:56.226Z runlikehell vncviewer[3031]: Child: 3035: RfbConnection: Enabling extension 'Chat' 1
<15> 2019-04-08T15:39:56.226Z runlikehell vncviewer[3031]: Child: 3035: RfbConnection: Enabling extension 'Chat2' 1
<15> 2019-04-08T15:39:56.226Z runlikehell vncviewer[3031]: Child: 3035: RfbConnection: Enabling extension 'Elevate' 1
<15> 2019-04-08T15:39:56.226Z runlikehell vncviewer[3031]: Child: 3035: RfbConnection: Enabling extension 'Elevated' 1
<15> 2019-04-08T15:39:56.226Z runlikehell vncviewer[3031]: Child: 3035: RfbConnection: Enabling extension 'Reboot' 1
<15> 2019-04-08T15:39:56.500Z runlikehell vncviewer[3031]: ListViewImpl: Reload data
<14> 2019-04-08T15:39:56.533Z runlikehell vncviewer[3031]: Child: 3035: QualSelector: Server pixel format depth 24 (32 bpp) little-endian rgb888
<15> 2019-04-08T15:39:56.533Z runlikehell vncviewer[3031]: Child: 3035: CSession: setDesktopSize 1280x1024
<15> 2019-04-08T15:39:56.533Z runlikehell vncviewer[3031]: Child: 3035: CConnection: Initialisation done
<15> 2019-04-08T15:39:56.533Z runlikehell vncviewer[3031]: Child: 3035: ConfigParameter: set RelativePtr(bool) to 0, priority 20
<14> 2019-04-08T15:39:56.533Z runlikehell vncviewer[3031]: Child: 3035: QualSelector: requesting initial update
<14> 2019-04-08T15:39:56.533Z runlikehell vncviewer[3031]: Child: 3035: QualSelector: Requesting ZRLE2 encoding (line speed 0 kbit/s)
<14> 2019-04-08T15:39:56.533Z runlikehell vncviewer[3031]: Child: 3035: QualSelector: Using pixel format depth 6 (8 bpp) rgb222
<15> 2019-04-08T15:39:56.533Z runlikehell vncviewer[3031]: Child: 3035: TXClipboardWindow: PRIMARY selection time is 2840563, later 1
<15> 2019-04-08T15:39:56.533Z runlikehell vncviewer[3031]: Child: 3035: CDesktopX11: FocusIn: 0x6000008, 0, 5
<15> 2019-04-08T15:39:56.533Z runlikehell vncviewer[3031]: Child: 3035: TXClipboardWindow: CLIPBOARD selection time is 2840563, later 0
<15> 2019-04-08T15:39:56.533Z runlikehell vncviewer[3031]: Child: 3035: CDesktopX11: FocusOut: 0x6000008, 0, 5
<15> 2019-04-08T15:39:56.533Z runlikehell vncviewer[3031]: Child: 3035: CDesktopX11: FocusIn: 0x6000008, 0, 0
<15> 2019-04-08T15:39:56.545Z runlikehell vncviewer[3031]: Child: 3035: TXClipboardWindow: PRIMARY selection time is 2840563, later 0
<15> 2019-04-08T15:39:56.545Z runlikehell vncviewer[3031]: Child: 3035: TXClipboardWindow: CLIPBOARD selection time is 2840563, later 0
<15> 2019-04-08T15:39:56.545Z runlikehell vncviewer[3031]: Child: 3035: TXClipboardWindow: selections were old; ignoring
<14> 2019-04-08T15:39:57.549Z runlikehell vncviewer[3031]: Child: 3035: QualSelector: Requesting full color (line speed 7657 kbit/s)
<14> 2019-04-08T15:39:57.549Z runlikehell vncviewer[3031]: Child: 3035: QualSelector: Using pixel format depth 24 (32 bpp) little-endian rgb888
<14> 2019-04-08T15:39:58.399Z runlikehell vncviewer[3031]: Child: 3035: QualSelector: Requesting ZRLE2 encoding (line speed 40240 kbit/s)
<15> 2019-04-08T15:39:58.832Z runlikehell vncviewer[3031]: Child: 3035: CDesktopX11: FocusOut: 0x6000008, 0, 3
<15> 2019-04-08T15:40:10.178Z runlikehell vncviewer[3031]: Child: 3035: CDesktopX11: FocusIn: 0x6000008, 0, 0
<15> 2019-04-08T15:40:10.192Z runlikehell vncviewer[3031]: Child: 3035: TXClipboardWindow: PRIMARY selection time is 2840563, later 0
<15> 2019-04-08T15:40:10.197Z runlikehell vncviewer[3031]: Child: 3035: TXClipboardWindow: CLIPBOARD selection time is 2840563, later 0
<15> 2019-04-08T15:40:10.197Z runlikehell vncviewer[3031]: Child: 3035: TXClipboardWindow: selections were old; ignoring
<14> 2019-04-08T15:40:13.450Z runlikehell vncviewer[3031]: Child: 3035: CConnection: close: [EndOfStream] Die Verbindung wurde unerwartet beendet.
<15> 2019-04-08T15:40:13.450Z runlikehell vncviewer[3031]: Child: 3035: FdIo: shutdown 0x107a900 (fd=12), flush true (tellHandler true)
<15> 2019-04-08T15:40:13.450Z runlikehell vncviewer[3031]: Child: 3035: FdIo: shutdown complete 0x107a900 (fd=12)
<15> 2019-04-08T15:40:13.460Z runlikehell vncviewer[3031]: ListViewImpl: Reload data
<15> 2019-04-08T15:40:13.465Z runlikehell vncviewer[3031]: Child: 3035: Thumb: Creating thumbnail at 320,200
<14> 2019-04-08T15:40:13.465Z runlikehell vncviewer[3031]: Child: 3035: JpegEncoder: SetQuality 95, was 50 
<15> 2019-04-08T15:40:13.465Z runlikehell vncviewer[3031]: Child: 3035: IoPool: Open Ios in pool at shutdown: 0
<15> 2019-04-08T15:40:13.469Z runlikehell vncviewer[3031]: Ipc: AbChild: End of IO stream
<15> 2019-04-08T15:40:13.469Z runlikehell vncviewer[3031]: FdIo: shutdown 0x21977e0 (fd=8), flush false (tellHandler false) 
<15> 2019-04-08T15:40:13.469Z runlikehell vncviewer[3031]: FdIo: immediate shutdown 0x21977e0 (fd=8)

Server:

08/04/2019 17:39:53 Got connection from client 10.0.0.101
08/04/2019 17:39:53   other clients:
08/04/2019 17:39:54 Normal socket connection
08/04/2019 17:39:54 Disabled X server key autorepeat.
08/04/2019 17:39:54   to force back on run: 'xset r on' (3 times)
08/04/2019 17:39:54 guessed desktop: xfce
08/04/2019 17:39:54 guessed dbus:
08/04/2019 17:39:54 running command:

   xfconf-query -v -c xfce4-desktop -p /backdrop/screen0/monitor0/color-style -s '0'

Die Eigenschaft »/backdrop/screen0/monitor0/color-style« ist in dem Kanal »xfce4-desktop« nicht vorhanden. Um eine neue Eigenschaft anzulegen, bitte die Option --create« benutzen.
08/04/2019 17:39:54 running command:

   xfconf-query -v -c xfce4-desktop -p /backdrop/screen0/monitor0/image-show -s 'false'

Die Eigenschaft »/backdrop/screen0/monitor0/image-show« ist in dem Kanal »xfce4-desktop« nicht vorhanden. Um eine neue Eigenschaft anzulegen, bitte die Option --create« benutzen.
08/04/2019 17:39:54 incr accepted_client=125 for 10.0.0.101:60042  sock=11
08/04/2019 17:39:54 Client Protocol Version 3.8
08/04/2019 17:39:54 Protocol version sent 3.8, using 3.8
08/04/2019 17:39:54 rfbProcessClientSecurityType: executing handler for type 2
08/04/2019 17:39:54 switching DPMS state from DPMSModeOff to DPMSModeOn
08/04/2019 17:39:54 created   xdamage object: 0x4000a6
08/04/2019 17:39:56 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0x00000018)
08/04/2019 17:39:56 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0x00000016)
08/04/2019 17:39:56 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0x00000015)
08/04/2019 17:39:56 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0x0000000F)
08/04/2019 17:39:56 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFFFEC6)
08/04/2019 17:39:56 Enabling full-color cursor updates for client 10.0.0.101
08/04/2019 17:39:56 Enabling NewFBSize protocol extension for client 10.0.0.101
08/04/2019 17:39:56 Using ZRLE encoding for client 10.0.0.101
08/04/2019 17:39:56 Pixel format for client 10.0.0.101:
08/04/2019 17:39:56   8 bpp, depth 6
08/04/2019 17:39:56   true colour: max r 3 g 3 b 3, shift r 4 g 2 b 0
08/04/2019 17:39:57 Pixel format for client 10.0.0.101:
08/04/2019 17:39:57   32 bpp, depth 24, little endian
08/04/2019 17:39:57   true colour: max r 255 g 255 b 255, shift r 16 g 8 b 0
08/04/2019 17:39:57 no translation needed
08/04/2019 17:39:58 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0x00000018)
08/04/2019 17:39:58 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0x0000000F)
08/04/2019 17:39:58 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0x00000016)
08/04/2019 17:39:58 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0x00000015)
08/04/2019 17:39:58 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFFFEC6)
08/04/2019 17:39:58 Enabling full-color cursor updates for client 10.0.0.101
08/04/2019 17:39:58 Enabling NewFBSize protocol extension for client 10.0.0.101
08/04/2019 17:39:58 Switching from ZRLE to hextile Encoding for client 10.0.0.101
08/04/2019 17:39:58 client_set_net: 10.0.0.101  0.0001
08/04/2019 17:40:13 client_count: 0
08/04/2019 17:40:13 Restored X server key autorepeat to: 1
08/04/2019 17:40:13 guessed dbus:
08/04/2019 17:40:13 Client 10.0.0.101 gone
08/04/2019 17:40:13 Statistics             events    Transmit/ RawEquiv ( saved)
08/04/2019 17:40:13  FramebufferUpdate   :      3 |         0/        0 (  0.0%)
08/04/2019 17:40:13  hextile             :      1 |        16/     1308 ( 98.8%)
08/04/2019 17:40:13  ZRLE                :      2 |    176337/  6553600 ( 97.3%)
08/04/2019 17:40:13  RichCursor          :      2 |      1776/     1776 (  0.0%)
08/04/2019 17:40:13  TOTALS              :      8 |    178129/  6556684 ( 97.3%)
08/04/2019 17:40:13 Statistics             events    Received/ RawEquiv ( saved)
08/04/2019 17:40:13  PointerEvent        :     51 |       306/      306 (  0.0%)
08/04/2019 17:40:13  FramebufferUpdate   :      4 |        40/       40 (  0.0%)
08/04/2019 17:40:13  SetPixelFormat      :      2 |        40/       40 (  0.0%)
08/04/2019 17:40:13  SetEncodings        :      2 |       112/      112 (  0.0%)
08/04/2019 17:40:13  TOTALS              :     59 |       498/      498 (  0.0%)
08/04/2019 17:40:13 destroyed xdamage object: 0x4000a6

So the client caught an unexpected closing of the connection:

CConnection: close: [EndOfStream] Die Verbindung wurde unerwartet beendet.

The server doesn't say why it closed the connection.

I noticed that the client logged

RfbConnection: Peer does not support sync, KeepAlive disabled

Does that mean something?

My .x11vncrc

display :0
auth ~/.Xauthority
rfbauth /home/nas/.vnc/passwd 
loop
nevershared
forever
solid
cursor arrow
nodpms

And I start it from my .xprofile

# using the authority-file (see .x11vncrc) doesn't work during start-up, so have x11vnc guess it
x11vnc -auth guess &

I could find anything which option defaults to 15 seconds. I mean it's nice that it closes the connection automatically, but it shouldn't do it after just 15 seconds.

How do I keep the connection open for a few minutes?

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