There are several places in our code which formulates a network address via the concatenation of (host,colon,port (e.g. host:port). Unfortunately this only works for IPv4, not IPv6 because colon is a reserved character in IPv6 hexadecimal addresses. This is a non-issue for DNS names, but if someone specifies an IPv6 hexadecimal address it would probably break.

We have an outstanding ticket to fix internationalized host names. The proposed solution is to introduce a hostname object that knows how to do presentation etc. A good idea would be to extend this to a network address object which not only knows about host name presentation but also the inet type and ports.

Here is a list of the places I found which form some type of network address using colon concatenation:

/home/jdennis/src/freeipa/ipapython/dogtag.py:75
uri = 'https://%s:%d%s' % (host, port, url)

/home/jdennis/src/freeipa/ipapython/dogtag.py:113
uri = 'http://%s:%s%s' % (host, port, url)

/home/jdennis/src/freeipa/install/tools/ipa-csreplica-manage:229
sys.exit("Unable to connect to %s:%d: %s" % (replica1, PORT, convert_error(e)))

/home/jdennis/src/freeipa/install/tools/ipa-csreplica-manage:340
sys.exit("Unable to connect to %s:%d %s" % (replica1, PORT, convert_error(e)))

/home/jdennis/src/freeipa/ipaserver/ipaldap.py:218
SimpleLDAPObject.init(self,'ldaps://%s:%d' % (self.host,self.port))

/home/jdennis/src/freeipa/ipaserver/ipaldap.py:223
SimpleLDAPObject.init(self,'ldap://%s:%d' % (self.host,self.port))

/home/jdennis/src/freeipa/ipaserver/ipaldap.py:333
return "ldap://%s:%d/" % (self.host,self.port)

/home/jdennis/src/freeipa/ipaserver/install/cainstance.py:666
args.append("https://%s:%d" % (self.master_host, 443))

/home/jdennis/src/freeipa/ipaserver/install/cainstance.py:750
'%s:%d' % (self.fqdn, AGENT_SECURE_PORT),

/home/jdennis/src/freeipa/ipaserver/install/cainstance.py:770
'%s:%d' % (self.fqdn, AGENT_SECURE_PORT),

/home/jdennis/src/freeipa/ipaserver/install/cainstance.py:813
ld = ldap.initialize("ldap://%s:%d" % (self.fqdn, self.ds_port))

/home/jdennis/src/freeipa/ipaserver/install/replication.py:337
return "ldap://%s:%d/" % (conn.host, conn.port)