Hi All

I found a interesting issue with /etc/hosts setting in different Linux system.

My stunnel.conf setting like below

[HOST] cert = client.crt key = client.key CAfile = server.crt client = yes accept = 10.160.160.88:57853 connect = 10.136.160.21:3520

I would like to connect server 10.136.160.21:3520 via stunnel 10.160.160.88:57853

Part A If my hostname and /etc/hosts setting in different System as followings all will works well

1. CentOS 7 32bit

$hostname localhost.localdomain $ cat /etc/hosts 127.0.0.1 localhost localhost4 localhost4.localdomain4 10.136.160.88 localhost.localadmin

2. Redhat 7 64bit

$hostname localhost.localdomain $ cat /etc/hosts 127.0.0.1 localhost localhost4 localhost4.localdomain4 10.136.160.88 localhost.localadmin

3. Ubuntu15.10 64bit $hostname virtual-machine $ cat /etc/hosts 127.0.0.1 localhost 10.136.160.88 virtual-machine Part B. If the "127.0.0.1" include the hostname in /etc/hosts, both CentOS and Fedora will fail, but Ubuntu still work

1. CentOS 7 32bit

$hostname localhost.localdomain $ cat /etc/hosts 127.0.0.1 localhost* localhost.localdomain* localhost4 localhost4.localdomain4 10.136.160.253 localhost.localdomain

2. Redhat 7 64bit

$hostname localhost.localdomain $ cat /etc/hosts 127.0.0.1 localhost *localhost.localdomain* localhost4 localhost4.localdomain4 10.136.160.88 localhost.localadmin

3. Ubuntu15.10 64bit $hostname virtual-machine $ cat /etc/hosts 127.0.0.1 localhost *virtual-machine* 10.136.160.88 virtual-machine I think it maybe not a stunnel issue, but I'd like to know why it has different behavior

Thanks Jay