dual stack binding

abatie nginx-forum at forum.nginx.org
Thu Jun 21 20:37:32 UTC 2018

I have nginx binding to a variety of addresses for ssl and target selection
reasons.  Now I'm trying to add ipv6 support.  Since I'm using specific
listen addresses, I wouldn't expect to have a binding conflict, however I
am, and I'm hoping someone can point me in the right direction:

    server {
    server {
	listen [2607:f678::17:79]:25;

<mailproxy-lb-01.peak.org> [150] # service nginx restart
Stopping nginx:                                            [FAILED]
Starting nginx: nginx: [emerg] bind() to [2607:f678::17:79]:25 failed (99:
Cannot assign requested address)

The local mail server is only listening on localhost:

tcp        0      0 ::1:25                      :::*                       

Commenting out the smtp server config just moves the conflict to the next
port in question...

CentOS release 6.9 (Final)

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,280234,280234#msg-280234

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