[Freeswitch-users] [Solved] FS shutdown not closing TCP port causes TIME_WAIT problems

[Anthony Minessale]

How exactly does it "stop" freeswitch?

On Tue, Apr 3, 2012 at 11:17 AM, Mario G <mario_fs at mgtech.com> wrote:
> I am posting this in case someone else runs into this, especially since I
> found it may not be Mac OSX specific (I was able to duplicate on SUSE
> although not as much).
>
> Both of the following conditions must exist:
> 1. You have at least one TCP local extension. In this case, due to Bria,
> etc. on an iPad, using TCP reduced battery usage since no need to run in
> background.
> 2. FreeSwitch is recycled very quickly, in this case down/up within 30
> seconds because it was automated at 2am each day. I needed it due to a long
> running sofia memory leak on OSX which may be resolved but I need to test.
>
> Problem: The extension using TCP cause a TIME_WAIT that keeps the 5060 port
> active (but NOT open) on the TCP stack, in my case it was 30 seconds but I
> found the time could be different on other platforms. When FreeSwitch comes
> back up the "internal.xml" profile fails because port 5060 is in use. If FS
> is brought up AFTER the TIME_WAIT goes away there is no problem, but in my
> case it was very quick each night to minimize the outage.
>
> Solution: I changed the OSX plist that auto restarts FS to run a script that
> starts FS, this makes no difference except a script is more flexible. Rather
> than use an arbitrary sleep time I check for port 5060 which is more
> reliable and faster. I tested this many times using different scenarios and
> all worked. Note I tried to use the "lsof -i TCP:5060" command but it shows
> only OPEN ports so it won't work.
>
> #!/bin/sh
> while : ; do
>    a=$(/usr/sbin/netstat -p tcp)
>    if [[ "$a" != *sip* ]] ; then
>      break
>    fi
>    echo "Port 5060 still in use - waiting for it to free up"
>    echo "${a}"
>    /bin/sleep 3
> done
> /usr/local/freeswitch/bin/freeswitch -nc -nonat
>
> #   a=$(/usr/sbin/lsof -i TCP:5060)  <- only shows open ports
> #   if [ "$a" = "" ] ; then
>
>
>
> On Apr 3, 2012, at 8:53 AM, Mario G wrote:
>
> For anyone who may run into this see "FS shutdown not closing TCP port
> causes TIME_WAIT problems" for follow up and solution.
> On Apr 2, 2012, at 1:33 PM, Mario G wrote:
>
> That's what I was thinking, trying to figure out how now. Will post a
> solution when I get one.
>
> On Apr 2, 2012, at 1:28 PM, Anthony Minessale wrote:
>
> From what I see, sofia uses the REUSEADDR flag so I will bet its yet
>
> another MAC specific thing.
>
> I am not really sure what you can do since you tend to find issues
>
> deep inside libsofia-sip and its portability to OSX.
>
> Maybe make your restart script sleep a bit?
>
>
> libs/sofia-sip/libsofia-sip-ua/tport/tport_type_tcp.c:
>
> su_setreuseaddr(socket, 1);
>
>
>
>
>
> On Mon, Apr 2, 2012 at 3:13 PM, Mario G <mario_fs at mgtech.com> wrote:
>
> If FS is shutdown and started too quickly, the internal profile ip/port
> stays in use and FS will fail to start it. After searching on the wen I
> found many references to TIME_WAIT but all fixes were to the program source.
> So I am wondering if when FS/sofia shuts down they are not releasing the
> ip/port for internal. If it's true, I found some source changes to solve it.
> Google "TIME-WAIT" and you'll find lots of good stuff like
> http://serverfault.com/questions/329845/how-to-forcibly-close-a-socket-in-time-wait.
> Apparently there is no way to free up the port manually. Help/comments
> anyone?
>
> Mario G
>
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> --
>
> Anthony Minessale II
>
>
>
>
>
> _________________________________________________________________________
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> http://www.freeswitchsolutions.com
>
> 
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-- 
Anthony Minessale II

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