Posit Workbench connection pane grayed out

Description:

Posit Workbench connection pane is grayed out.

Resolution:

Step 1. Back up and remove the connection-history-database.json file;

File location in RStudio Workbench 1.3 and older: /home/<username>/.rstudio/monitored/connection_history/connection-history-database.json

File location in RStudio Workbench 1.4 and above: 
/home/<username>/.local/share/rstudio/monitored/connection_history/connection-history-database.json

Step 2. Reset User state, https://support.posit.co/hc/en-us/articles/218730228-Resetting-a-user-s-state-in-the-RStudio-IDE-on-Posit-RStudio-Workbench-RStudio-Server

RStudio Workbench 1.3:

e.g.,  

mv /home/<username>/.rstudio/ /home/<username>/.rstudio-backup

RStudio Workbench 1.4:

e.g.,  

mv /home/<username>/.local/share/rstudio/ /home/<username>/.local/share/rstudio-backup