Redis 2.6.8 is unable to auth to master when master have a password...
if the password removed it can sync perfectly.
both master n slave using redis 2.6.8

previously i'm using older redis version for both master n slave it can sync with master password.

here is the log:

[3289] 15 Jan 10:26:53.942 # Server started, Redis version 2.6.8
[3289] 15 Jan 10:26:53.943 * The server is now ready to accept connections on port 6379
[3289] 15 Jan 10:26:53.943 * Connecting to MASTER...
[3289] 15 Jan 10:26:53.943 * MASTER <-> SLAVE sync started
[3289] 15 Jan 10:26:53.944 * Non blocking connect for SYNC fired the event.
[3289] 15 Jan 10:26:53.946 * Master replied to PING, replication can continue...
[3289] 15 Jan 10:26:53.946 # Unable to AUTH to MASTER: Reading from master: Operation now in progress
[3289] 15 Jan 10:26:55.029 * Connecting to MASTER...
[3289] 15 Jan 10:26:55.029 * MASTER <-> SLAVE sync started
[3289] 15 Jan 10:26:55.031 * Non blocking connect for SYNC fired the event.
[3289] 15 Jan 10:26:55.033 * Master replied to PING, replication can continue...
[3289] 15 Jan 10:26:55.033 # Unable to AUTH to MASTER: Reading from master: Operation now in progress