RSelenium: server signals port is already in use

user_3886898 0
Viewed 17459

I'm using the following code in RSelenium to open a browser. After I close the browser, or even close the handler by running remDr$close(), the port is still in use. I have to go to the terminal and manually kill the process so that the same port becomes available. Is there any automated way such that RSelenium makes the port free after it finishes scraping?

So here is my code:

library(RSelenium)
rD <- rsDriver(verbose = FALSE,port=4444L)
remDr <- rD$client
remDr$close()

Thanks

rselenium r
7 Answers

I did not have issues until recently. What worked for me is to use the solution above and as per the solution in this thread to add a line to kill the Java instance(s) inside RStudio.

remDr$close()
rD$server$stop()
rm(rD, remDr)
gc()

system("taskkill /im java.exe /f", intern=FALSE, ignore.stdout=FALSE)
user_20724400

The command:

system("taskkill /im java.exe /f", intern=FALSE, ignore.stdout=FALSE)

will free all the ports.

If you want to free a particular port, you can do this:

#get the PID of the process you launched

pid <- driver$server$process$get_pid()

#pasting this PID in the following command (will kill all the child processes as well, closes the browser as well)

system(paste0("Taskkill /F /T" ," /PID ", pid))
user_140351090

One way to avoid this problem is to use free_port() to find a free port (rather than specifying it manually)

library(netstat)
rsDriver(verbose = FALSE, port=free_port())
user_57837450

What worked for me is not calling stop at all and only calling close.

rD <- rsDriver(port = 4444L)
remDr <- rD[["client"]]
remDr$close()
rm(rD)
gc()

EDIT: Nevermind - this worked last week several times and then hasn't worked again.

user_121413060

I tried all the versions for a similar script:

   driver = rsDriver(browser = c("firefox"))
   remDr <- driver[["client"]]

... , which at some point started to give the next error:

    Error in wdman::selenium(port = port, verbose = verbose, version = version, 
: Selenium server signals port = 4567 is already in use.

Non of the suggestions worked for closing the port 4567, neither restarting of the browser and the RStudio, except for specifying a different port.

driver = rsDriver(browser = c("firefox"), verbose = FALSE, port = 4444L)
remDr <- driver[["client"]]

A list of ports (e.g. 4445L, 4446L, 4447L, etc) works as well or reloading the session by pressing Ctrl + Shift + F10

user_174714610

Assuming that the issue arises after cleaning the environment in RStudio, I found the easiest solution was to simply garbage collect:

gc()
user_40383020
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