SEND_FAIL_REWIND <sending data requires a rewind that failed>
SSL_ENGINE_INITFAILED <failed to initialise ENGINE>
LOGIN_DENIED <user or password not accepted. failed to login>
+TFTP_NOTFOUND <file not found on server>
+TFTP_PERM <permission problem on server>
+TFTP_DISKFULL <out of disk space on server>
+TFTP_ILLEGAL <illegal TFTP operation>
+TFTP_UNKNOWNID <unknown transfer ID>
+TFTP_EXISTS <file already exists>
+TFTP_NOSUCHUSER <no such user>
CURL_LAST <CURLMSG.MSG is out of sync with the source code>
.END