Hello, I have access to my database via command line and through workbench, and have access on the grant tables: mysql> SELECT host,user,password,select_priv,insert_priv FROM user; +------+-------+-------------------------------------------+-------------+-------------+ | host | user | password | select_priv | insert_priv | +------+-------+-------------------------------------------+-------------+-------------+ | % | adick | *D2D62126137364E6FDFD43E4887123C99C4C6B57 | Y | Y | | % | root | *D2D62126137364E6FDFD43E4887123C99C4C6B57 | Y | Y | +------+-------+-------------------------------------------+-------------+-------------+ 2 rows in set (0.00 sec) But when I run the following: > library(RMySQL) Loading required package: DBI > drv = dbDriver("MySQL") > con = dbConnect(drv, user="adick", password = "***", dbname="***", host="***") Error in mysqlNewConnection(drv, ...) : RS-DBI driver: (Failed to connect to database: Error: Access denied for user 'adick'@'host' (using password: YES) ) Further, this error is sporadic. For example, it ran successfully yesterday afternoon. I have installed two MySQL databases on two separate computers and am having the same problems. Tried restarting computers/databases etc. Also, there are no limits to these users on number of connections etc. I am completely stumped at this point. R version 2.15.1 (2012-06-22) -- "Roasted Marshmallows" Copyright (C) 2012 The R Foundation for Statistical Computing ISBN 3-900051-07-0 Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit) Anthony -- Anthony Steven Dick, Ph.D. Assistant Professor Director, Developmental Science Program Department of Psychology Florida International University Modesto A. Maidique Campus DM 296B 11200 S.W. 8th Street Miami, FL 33199 Phone: 305-348-4202 (try this first) Lab Phone: 305-348-9057 or 305-348-9055 Fax: 305-348-3879 Email: adick at fiu.edu Webpage: http://www.fiu.edu/~adick Lab Webpage: http://dcn.fiu.edu