Currently I am trying to synchronize two folders between my NAS and my main computer. On both machines I can access the web app. However, once I try to pair these machines with a secret phrase I get the following error:
 
illegal control characters in pairing message; ignoring

The log on one machine is:

[2016-03-18 14:25:16.861132] main: Pairing in progress
Generating public/private rsa key pair.
Your identification has been saved in /var/folders/_v/hkf9zbqs0bgd2vcnmr_qnlgm0000gn/T/git-annex-keygenN92651/key.
Your public key has been saved in /var/folders/_v/hkf9zbqs0bgd2vcnmr_qnlgm0000gn/T/git-annex-keygenN92651/key.pub.
The key fingerprint is:
SHA256:beyV1f5MKFGaaH9p1CRMPmaVcYAmOyc/lhp7HCw668M username@iMac.home
The key's randomart image is:
+---[RSA 2048]----+
|             +=o*|
|          ..o=.B.|
|          o++ B o|
|         ++..B = |
|        S +*=.= o|
|         oo.B+ o.|
|       . ..B o  o|
|        E o o    |
|       .o+ .     |
+----[SHA256]-----+
[2016-03-18 14:25:26.442301] main: Pairing in progress
 
  illegal control characters in pairing message; ignoring
 
  illegal control characters in pairing message; ignoring
 
  illegal control characters in pairing message; ignoring
 
  illegal control characters in pairing message; ignoring

While on the other machine I get:

[2016-03-18 14:25:35 CET] main: Pairing with username@iMac.home:~/Desktop/annex in progress