I am using the Redis server from the link :
http://cloud.github.com/downloads/rgl/redis/redis-2.4.6-setup-64-bit.exe
with R version3.0.3, doRedis 1.1.0, rredis 1.6.8
I reported this issue to Bryan Lewis, the author of the doRedis and rredis packages. He replied that he is working to resolve the problem and will update the package on CRAN when it is fixed. In the meantime, you could downgrade to doRedis version 1.0.5 which doesn't have this problem.