ReadyNAS Replicate Job Returning "Connect error code: -51"

Hi All,

(Please do not tell me to contact support. They are thoroughly unhelpful.)

I recently purchased a second ReadyNAS RN102. Both ReadyNAS RN 102's are running on OS 6.6.0 and are on the same network.

I enabled ReadyNAS Replicate on both devices and registered them with the same ReadyNAS Replicate account. Both have static IP addresses, are a part of the same DNS server with 8.8.8.8 added as alternative DNS's, and IPv6 is disabled completely.

Eventually, I want to be able to move one of these devices to another location, but still have them replicate to each other.

When I create a job that is supposed to replicate some data (a small amount for test purposes) from one ReadyNAS to the other (and vice versa), I receive the below error in an email message stating, "Connect error code: -51". What is this error and how can I fix it?

[2016-11-10 12:11:35] [Info] Replicate version: 1.3.0 build R2
[2016-11-10 12:11:35] [Info] Starting backup job "Data Backup [2016-11-10 11h 41m AM]"
[2016-11-10 12:11:35] [Info] Locking target folder: /data/Replicate-Test/Data Backup [2016-11-10 11h 41m AM]
[2016-11-10 12:11:36] [Info] Resume folder is "/data/Replicate-Test/Data Backup [2016-11-10 11h 41m AM]/2016-11-10 11-42 (failed)/data"
[2016-11-10 12:11:36] [Warning] Incremental not possible
[2016-11-10 12:11:36] [Info] p2p connect to nas-xx-xx-06 in xxxxxxxx network
[2016-11-10 12:11:59] [Info] p2p connect to nas-xx-xx-06 in xxxxxxxx network
[2016-11-10 12:12:12] [Error] Unable to connect to nas-xx-xx-06
[2016-11-10 12:12:12] [Error] Connect error code: -51
[2016-11-10 12:12:12] [Error] Please check source device is online and Replicate service is running
[2016-11-10 12:12:12] [Info] Unlock target folder: /data/Replicate-Test/Data Backup [2016-11-10 11h 41m AM]
[2016-11-10 12:12:12] [Info] Job finished