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Description of problem:
when doing up down, it works but second up fails

[root@wlan-ralink-rt2500 ~]# nmcli c u gsm-ttyACM1
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/91)
[root@wlan-ralink-rt2500 ~]# nmcli  connection down gsm-ttyACM1 
Connection 'gsm-ttyACM1' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/91)
[root@wlan-ralink-rt2500 ~]# nmcli c u gsm-ttyACM1
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/92)
[root@wlan-ralink-rt2500 ~]# nmcli c u gsm-ttyACM1
Error: Connection activation failed.


Version-Release number of selected component (if applicable):
ModemManager-1.6-0.3.rc3.el7.centos.lr1.x86_64
NetworkManager-1.2.0-1.el7.centos.rh1331395.x86_64

How reproducible:
weirdly

Steps to Reproduce:
1.create dhcp connection for the modem
2.up it and up it again


Actual results:
fail for reconnect

Expected results:
should work well

Additional info:

Created attachment 1154132 [details]
mm and nm debug logs

[root@wlan-ralink-rt2500 ~]# lsusb
Bus 001 Device 005: ID 0bdb:190d Ericsson Business Mobile Networks BV

Created attachment 1154180 [details]
debul log from yet another device

not sure if this is exactly the same but can be triggered via creation autoconnectable connection and upping it in a while (novice mode creation and nmcli con up in a while or file creation, reload and up).  

device:
Bus 001 Device 006: ID 12d1:1001 Huawei Technologies Co., Ltd. E169/E620/E800 HSDPA Modem

(In reply to Vladimir Benes from comment #3)
> Created attachment 1154180 [details]
> debul log from yet another device
> 
> not sure if this is exactly the same but can be triggered via creation
> autoconnectable connection and upping it in a while (novice mode creation
> and nmcli con up in a while or file creation, reload and up).  
> 
> device:
> Bus 001 Device 006: ID 12d1:1001 Huawei Technologies Co., Ltd.
> E169/E620/E800 HSDPA Modem

That's a different thing I guess.

https://github.com/NetworkManager/ModemManager/commit/a997c821ce52a03392774f9b54ead885fc56e77b
https://github.com/NetworkManager/ModemManager/commit/ce44197626b4f5c6e32769403932b8a6b280b708

This one is also CME 277, so it's a dupe of bug 1334325, and should be fixed in ModemManager-1.6-0.4.20160615git8080be8.el7

*** This bug has been marked as a duplicate of bug 1334325 ***