I have N5 too and for me works this:

1. From short menu on top screen turn on WiFi and Hotspot.
2. Go to Settings menu/Hotspot and several times switch it on/off.
   raduspl

Additional options:

push “dhcp-option DNS 208.67.222.222”
push “dhcp-option DNS 208.67.220.220”

in the server configuration solved the problem.
Thx

I have two private vpn servers based on ubuntu openvpn software just as configured (I suppose).
The problem concerns only one of them located outside of my country.
Both use lzo, udp, TLS and ta.key.

Yes, I use lzo

Openvpn server (type TLS), Nexus 5, OTA-8 (16.04).
I can go vpn online only via wifi, via gsm data only allows you to establish a vpn connection to the server and go to the tun0 network.
Server configuration is correct - other Android devices are working correctly.
Many thanks for any help!

Error net::ERR_NAME_RESOLUTION_FAILED

On my Nexus 5 works but only via wifi connection.
OTA-7 (16.04).
I use openvpn type: certificates TLS, device type TUN, cipher AEC-256-CBC HMAC-1, additional ta.key
I use the VPN configurations app.

Signal now works.
I did nothing, probably changes were made on the server
Nexus 5
OTA-7 (16.04)
Signal 0.4.1

@guru maybe it is a radio interfetence problem. Change the channel or set it to auto (router).

@advocatux thx

Aftet installation I can not register. The app does not see/read the sms code and the manual entry causes error, statu code 404 or 423 (entering “-” sing is imposibble).
Nexus5
16.04 (OTA-6)
Signal v. 0.3.261