11-01-2012 10:01 AM
ASA5505 running ASA 9:
From the clientless SSL portal, I can browse some sites like:
www.cnn.com
www.lvrj.com
www.sunherald.com
www.arstechnica.com
These sites immediately come up as server unavailable:
www.facebook.com
www.bing.com
www.google.com
www.yahoo.com
www.cisco.com
This site used to show completely, now the part with the IP doesn't show up:
www.whatsmyip.org
I tried going back to 8.4 and these problems still happen.
Can anyone help me figure out the rhyme or reason for this?
Solved! Go to Solution.
11-01-2012 03:00 PM
Awesome!!
I am sorry, so I could not try with 9.0! I really appreciate your findings
Resolution found by Brendan Perez:
Disable IPv6 on the outside interface.
- Uncheck "Enable address autoconfiguration"
- Uncheck "Enable IPv6"
Please mark this post as resolved so other will learn from it.
11-01-2012 10:03 AM
Hi Brendan,
Are you using an internal or external DNS server? Have you tried with 4.2.2.2?
I have tried cisco.com and facebook.com without issues.
HTH.
Portu.
Please rate any helpful posts
11-01-2012 10:05 AM
I was using my internal DNS servers, but will try external.
They are MS AD servers that do all the lookups with root hints (no forwarders)
From machines on the inside of the network, I can browse all those sites so some resolution is happening.
I'll switch the DNS servers it uses and report back.
11-01-2012 10:09 AM
Sounds good
11-01-2012 11:31 AM
Still fails.
What's odd is that I'm seeing TCP resets when I go to the pages that fail. Here's the log info I have for an attempt to browse www.cisco.com. I paused logging, got to the portal page where I put in address, resumed logging and hit enter. I changed some things. FWInternetIP is the ip on the outside interface, Client IP is the IP that I'm on from the test computer.
6|Nov 01 2012|11:28:14|302016|64.250.229.100|123|InternalNTP|123|Teardown UDP connection 4363 for outside:64.250.229.100/123 to inside:InternalNTP/123 duration 0:02:01 bytes 96
6|Nov 01 2012|11:28:11|725007|Client IP|24658|||SSL session with client outside:Client IP/24658 terminated.
6|Nov 01 2012|11:28:11|302014|Client IP|24658|FWInternetIP|443|Teardown TCP connection 4417 for outside:Client IP/24658 to identity:FWInternetIP/443 duration 0:00:28 bytes 26768 TCP Reset-O
6|Nov 01 2012|11:28:11|302014|Client IP|36248|FWInternetIP|443|Teardown TCP connection 4420 for outside:Client IP/36248 to identity:FWInternetIP/443 duration 0:00:28 bytes 14601 TCP FINs
6|Nov 01 2012|11:28:11|725007|Client IP|36248|||SSL session with client outside:Client IP/36248 terminated.
6|Nov 01 2012|11:28:11|716003|||||Group
11-01-2012 01:08 PM
What if you try with a bookmark with smart-tunnel enabled?
Thanks.
11-01-2012 01:32 PM
I get a delay and then the browser's "unable to connect" page, but only for the sites I listed above .
Still no cisco, facebook, yahoo, google, fark. Slashdot, lvrj, twitter, sunherald are OK.
If I do an anyconnect vpn with my tunnel all profile, I can do anything/go anywhere without a problem. My hosts on the inside are OK too, so I think that rules out DNS.
I'm going over my config for perhaps inspection or some other craziness and don't see anything there either:
dns domain-lookup outside
dns domain-lookup inside
dns server-group DefaultDNS
name-server Internal1 (Removed during later testing
name-server Internal2 (Removed during later testing)
name-server 8.8.8.8
name-server 8.8.4.4
domain-name internaldomain.local
same-security-traffic permit intra-interface
webvpn
enable outside
anyconnect image disk0:/AnyConnect-3.1.01065/anyconnect-win-3.1.01065-k9.pkg 1 regex "Windows NT"
anyconnect image disk0:/AnyConnect-3.1.01065/anyconnect-macosx-i386-3.1.01065-k9.pkg 2 regex "Intel Mac OS X"
anyconnect image disk0:/AnyConnect-3.1.01065/anyconnect-linux-64-3.1.01065-k9.pkg 3 regex "Linux"
anyconnect image disk0:/AnyConnect-3.1.01065/anyconnect-linux-3.1.01065-k9.pkg 4 regex "Linux"
anyconnect enable
tunnel-group-list enable
ssl-server-check warn-on-failure
group-policy VPN_SSL internal
group-policy VPN_SSL attributes
dns-server value (INTERNAL DNS servers, also tried 8.8.8.8 and 8.8.4.4)
vpn-tunnel-protocol ssl-client ssl-clientless
split-tunnel-policy tunnelspecified
split-tunnel-network-list value Split_Tunnel_ACL
default-domain value internaldomain.local
webvpn
url-list none
anyconnect ssl dtls enable
anyconnect dpd-interval client 10
anyconnect dpd-interval gateway 30
anyconnect ask none default webvpn
tunnel-group VPN_SSL type remote-access
tunnel-group VPN_SSL general-attributes
address-pool VPN_Pool
default-group-policy VPN_SSL
tunnel-group VPN_SSL webvpn-attributes
group-alias SSL_VPN enable
tunnel-group-map default-group VPN_IPSEC
11-01-2012 01:56 PM
I think it's DNS + IPv6 that's causing the problem. I don't have IPv6 enabled on any interfaces. I'll poke around and reply back with anything I find.
firewall# show dns-hosts
Host Flags Age Type Address(es)
forums.radioreference.com(temp, OK) 0 IP 2400:cb00:2048:1::6ca2:c36e 2400:cb00:2048:1::6ca2:c30a
forums.radioreference.com cf-protected-forums.radio
radioreference.com (temp, OK) 0 IP 174.129.16.232
www.slashdot.org (temp, OK) 0 IP 216.34.181.48
www.lvrj.com (temp, OK) 0 IP 69.164.14.128 69.164.14.144
cdn-c.clickability.com clickabl-3.vo.llnwd.net
llnwd.net (temp, EX) 4 SOA dns11.llnwd.net hostmaster.llnwd.net
210 900 300 604800 300
www.google.com (temp, OK) 0 IP 2001:4860:4007:800::1012
www.facebook.com (temp, EX) 0 IP 2a03:2880:10:cf01:face:b00c::
firewall#
11-01-2012 02:05 PM
It's FIXED!
On the outside interface config, IPv6 tab "Enable IPv6" was NOT checked, but the box "Enable address autoconfiguration" WAS checked.
I verified by toggling that checkbox, clearing the cache and trying to ping the problem sites. Checked=no dice, unchecked=working.
Thank You jportugu for answering my posts and offering suggestions.
11-01-2012 03:00 PM
Awesome!!
I am sorry, so I could not try with 9.0! I really appreciate your findings
Resolution found by Brendan Perez:
Disable IPv6 on the outside interface.
- Uncheck "Enable address autoconfiguration"
- Uncheck "Enable IPv6"
Please mark this post as resolved so other will learn from it.
10-11-2013 03:33 PM
I'm having this same issue but IPv6 is definitely disabled on all interfaces. Also I do not get any IPv6 addresses with the command "show dns-hosts"
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