Error: pandoc document conversion failed with error 61

[spaghettiScreen]

I get the following error when trying to compile to a html_document. The actual knitting process completes to 100%, but Pandoc conversion then fails with the following error messages:

/usr/bin/pandoc +RTS -K512m -RTS rmd_file.utf8.md --to html4 --from markdown+autolink_bare_uris+tex_math_single_backslash --output rmd_file.html --email-obfuscation none --self-contained --standalone --section-divs --table-of-contents --toc-depth 3 --variable toc_float=1 --variable toc_selectors=h1,h2,h3 --variable toc_collapsed=1 --variable toc_smooth_scroll=1 --variable toc_print=1 --template /usr/lib/R/site-library/rmarkdown/rmd/h/default.html --no-highlight --variable highlightjs=1 --number-sections --css 'https://use.fontawesome.com/releases/v5.0.6/css/all.css' --variable 'theme:flatly' --include-in-header /tmp/RtmpiCmHh1/rmarkdown-strb51e6d5ce.html --mathjax --variable 'mathjax-url:https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML' --lua-filter /usr/lib/R/site-library/rmarkdown/rmd/lua/pagebreak.lua --lua-filter /usr/lib/R/site-library/rmarkdown/rmd/lua/latex-div.lua --variable code_folding=hide --variable code_menu=1 
Could not fetch https://use.fontawesome.com/releases/v5.0.6/css/all.css
HttpExceptionRequest Request {
  host                 = "use.fontawesome.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/releases/v5.0.6/css/all.css"
  queryString          = ""
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 (ConnectionFailure Network.BSD.getProtocolByName: does not exist (no such protocol name: tcp))
Error: pandoc document conversion failed with error 61
Execution halted