Error(s) in re-building vignettes:
  ...
--- re-building ‘connections.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/streamConnect.Rcheck/vign_test/streamConnect/vignettes/connections_files/figure-html/unnamed-chunk-8-1.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 24057 bytes
Input file size = 24159 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 21240
  zc = 9  zm = 8  zs = 1  f = 0
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 21240

Output IDAT size = 21240 bytes (2817 bytes decrease)
Output file size = 21318 bytes (2841 bytes = 11.76% decrease)

*  Host localhost:5650 was resolved.
*  IPv6: ::1
*  IPv4: 127.0.0.1
*    Trying [::1]:5650...
*  connect to ::1 port 5650 from ::1 port 57264 failed: Connection refused
*    Trying 127.0.0.1:5650...
*  connect to 127.0.0.1 port 5650 from 127.0.0.1 port 37096 failed: Connection refused
*  Failed to connect to localhost port 5650 after 6 ms: Couldn't connect to server
*  Closing connection
*  Hostname localhost was found in DNS cache
*    Trying [::1]:5650...
*  connect to ::1 port 5650 from ::1 port 57278 failed: Connection refused
*    Trying 127.0.0.1:5650...
*  connect to 127.0.0.1 port 5650 from 127.0.0.1 port 37104 failed: Connection refused
*  Failed to connect to localhost port 5650 after 1 ms: Couldn't connect to server
*  Closing connection
*  Hostname localhost was found in DNS cache
*    Trying [::1]:5650...
*  connect to ::1 port 5650 from ::1 port 57294 failed: Connection refused
*    Trying 127.0.0.1:5650...
*  connect to 127.0.0.1 port 5650 from 127.0.0.1 port 37106 failed: Connection refused
*  Failed to connect to localhost port 5650 after 1 ms: Couldn't connect to server
*  Closing connection

Quitting from lines 209-214 [unnamed-chunk-12] (connections.Rmd)
Error: processing vignette 'connections.Rmd' failed with diagnostics:
Failed to connect to localhost port 5650 after 1 ms: Couldn't connect to server
--- failed re-building ‘connections.Rmd’

SUMMARY: processing the following file failed:
  ‘connections.Rmd’

Error: Vignette re-building failed.
Execution halted