TwitteR, ROAuth and Windows: register OK, but certificate verify failed

I'm trying to get the number of followers of a large number of Twitter users with `twitteR`. Many of the other questions posted have been very useful in getting me this far, but none seem to be directly relevant to my problem, so far as I can see. I can register my OAuth credentials to a twitter R session, but then I can't seem to do anything at all, I just get is this message: `Error in function (type, msg, asError = TRUE) : SSL certificate problem, verify that the CA cert is OK. Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify fail` When I use the `twitteR` functions without using OAuth they work fine with no errors or warnings, but I bump into limits and protected accounts, which I thought I could avoid with OAuth. Here are the details: ``` library(twitteR) library(ROAuth) library(RCurl) # # Here's how I register my credentials # requestURL <- "https://api.twitter.com/oauth/request_token" accessURL = "https://api.twitter.com/oauth/access_token" authURL = "https://api.twitter.com/oauth/authorize" consumerKey = "------------" consumerSecret = "-----------" twitCred <- OAuthFactory$new(consumerKey=consumerKey, consumerSecret=consumerSecret, requestURL=requestURL, accessURL=accessURL, authURL=authURL) download.file(url="http://curl.haxx.se/ca/cacert.pem", destfile="cacert.pem") twitCred$handshake(cainfo="cacert.pem") To enable the connection, please direct your web browser to: https://api.twitter.com/oauth/authorize?oauth_token=xxxx When complete, record the PIN given to you and provide it here: xxxxxx registerTwitterOAuth(twitCred) [1] TRUE # so the OAuth bit appears to be ok... # # save it for a future sessions... save(list="twitCred", file="twitteR_credentials") # works, in future I can just load("twitteR_credentials") registerTwitterOAuth(twitCred) # # try to get follower numbers, here's where it goes south me <- getUser("Rbloggers") me$followersCount Error in function (type, msg, asError = TRUE) : SSL certificate problem, verify that the CA cert is OK. Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed # # another method, same problem getUser("Rbloggers")$followersCount Error in function (type, msg, asError = TRUE) : SSL certificate problem, verify that the CA cert is OK. Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed # # Here are the packages and versions I'm using sessionInfo() R version 2.14.1 (2011-12-22) Platform: i386-pc-mingw32/i386 (32-bit) locale: [1] LC_COLLATE=English_Australia.1252 LC_CTYPE=English_Australia.1252 [3] LC_MONETARY=English_Australia.1252 LC_NUMERIC=C [5] LC_TIME=English_Australia.1252 attached base packages: [1] stats4 stats graphics grDevices utils datasets methods base other attached packages: [1] ROAuth_0.9.2 digest_0.5.1 twitteR_0.99.19 rjson_0.2.6 RCurl_1.91-1.1 [6] bitops_1.0-4.1 igraph_0.5.5-4 topicmodels_0.1-4 tm_0.5-7 slam_0.1-23 [11] modeltools_0.2-18 lasso2_1.2-12 loaded via a namespace (and not attached): [1] tools_2.14.1 ``` How can I get the `twitteR` functions working after I register my credentials? UPDATE: Trying @Btibert3's suggestion gives the same error: ``` > ## Authenticate with Twitter = this is an important peice of code > registerTwitterOAuth(cred) [1] TRUE > ########################################################################## > ## lets test out what our session limits look like > ########################################################################## > rate.limit <- getCurRateLimitInfo() Error in function (type, msg, asError = TRUE) : SSL certificate problem, verify that the CA cert is OK. Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed ``` UPDATE following @flz's suggestion to add `cainfo="cacert.pem"` everywhere has fixed my problem: ``` rate.limit <- getCurRateLimitInfo( cainfo="cacert.pem") rate.limit resource limit remaining reset 1 /lists/subscribers 180 180 2013-03-27 09:35:37 2 /lists/list 15 15 2013-03-27 09:35:37 3 /lists/memberships 15 15 2013-03-27 09:35:37 4 /lists/ownerships 15 15 2013-03-27 09:35:37 5 /lists/subscriptions 15 15 2013-03-27 09:35:37 6 /lists/members 180 180 2013-03-27 09:35:37 7 /lists/subscribers/show 15 15 2013-03-27 09:35:37 8 /lists/statuses 180 180 2013-03-27 09:35:37 9 /lists/show 15 15 2013-03-27 09:35:37 10 /lists/members/show 15 15 2013-03-27 09:35:37 11 /application/rate_limit_status 180 179 2013-03-27 09:35:37 (etc) ``` Session Info: ``` sessionInfo() R version 2.15.3 (2013-03-01) Platform: x86_64-w64-mingw32/x64 (64-bit) locale: [1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United States.1252 [3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C [5] LC_TIME=English_United States.1252 attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] ROAuth_0.9.2 digest_0.6.3 twitteR_1.1.0 rjson_0.2.12 RCurl_1.95-4.1 bitops_1.0-5 loaded via a namespace (and not attached): [1] tools_2.15.3 ```