Question

URGENT: Unable to RPC over HTTP thru a Cisco ASA

Asked by: piotrmikula108

What do I need to disable / enable to allow the traffic for RPC over HTTP? Are there any IPS rules that would block it or something else?

sanitized sh run below

and 2 syslog messges

6 Jul 10 2009 08:30:50 302014 xx.xxx.xxx.xx HFS1 Teardown TCP connection 2835007 for outside:xx.xx.xx.xx.x/6319 to inside:HFS1/443 duration 0:00:00 bytes 4683 TCP FINs

6 Jul 10 2009 08:30:50 302014 xx.xx.xxx.xx HFS1 Teardown TCP connection 2835006 for outside:xx.xx.xx.xx/6318 to inside:HFS1/443 duration 0:00:00 bytes 4718 TCP FINs

Result of the command: "sh run"
 
: Saved
:
ASA Version 7.2(2) 
!
hostname HR1
domain-name xxx.local
enable password adgsdgsdg encrypted
names
name 10.215.77.1 HFS1 description File Server
!
interface Vlan1
 nameif inside
 security-level 100
 ip address 10.215.77.254 255.255.255.0 
!
interface Vlan2
 nameif outside
 security-level 0
 ip address xx.xx.xx.xx 255.255.255.248 
!
interface Ethernet0/0
 switchport access vlan 2
!
interface Ethernet0/1
!
interface Ethernet0/2
!
interface Ethernet0/3
!
interface Ethernet0/4
!
interface Ethernet0/5
!
interface Ethernet0/6
!
interface Ethernet0/7
!
passwd xxxxxx encrypted
ftp mode passive
dns server-group DefaultDNS
 domain-name xxxxxx.Local
object-group service Harvego tcp
 description Ports
 port-object range 3389 3389
 port-object eq www
 port-object eq https
 port-object eq smtp
access-list Outside_in extended permit tcp any interface outside object-group Harvego 
access-list Harvego_splitTunnelAcl standard permit 10.215.77.0 255.255.255.0 
access-list outside_cryptomap_1 extended permit ip 10.215.77.0 255.255.255.0 10.215.76.0 255.255.255.0 inactive 
access-list outside_cryptomap_1 extended permit ip any 10.215.77.8 255.255.255.248 
access-list Harvego_splitTunnelAcl_1 standard permit any 
pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
ip local pool xxxxxxxx 10.215.77.10-10.215.77.15 mask 255.255.255.0
ip verify reverse-path interface inside
ip verify reverse-path interface outside
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-522.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list outside_cryptomap_1
nat (inside) 1 10.215.77.0 255.255.255.0
static (inside,outside) tcp interface www HFS1 www netmask 255.255.255.255 
static (inside,outside) tcp interface smtp HFS1 smtp netmask 255.255.255.255 
static (inside,outside) tcp interface https HFS1 https netmask 255.255.255.255 
access-group Outside_in in interface outside
route outside 0.0.0.0 0.0.0.0 xx.xx.x.x.x  1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout uauth 0:05:00 absolute
group-policy DfltGrpPolicy attributes
 banner none
 wins-server value 10.215.77.1
 dns-server value 10.215.77.1
 dhcp-network-scope none
 vpn-access-hours none
 vpn-simultaneous-logins 3
 vpn-idle-timeout 30
 vpn-session-timeout none
 vpn-filter none
 vpn-tunnel-protocol IPSec l2tp-ipsec webvpn
 password-storage disable
 ip-comp disable
 re-xauth disable
 group-lock none
 pfs enable
 ipsec-udp disable
 ipsec-udp-port 10000
 split-tunnel-policy tunnelall
 split-tunnel-network-list none
 default-domain none
 split-dns value xxxxxx.local 
 intercept-dhcp 255.255.255.255 disable
 secure-unit-authentication disable
 user-authentication disable
 user-authentication-idle-timeout 30
 ip-phone-bypass disable
 leap-bypass disable
 nem disable
 backup-servers keep-client-config
 msie-proxy server none
 msie-proxy method no-modify
 msie-proxy except-list none
 msie-proxy local-bypass disable
 nac disable
 nac-sq-period 300
 nac-reval-period 36000
 nac-default-acl none
 address-pools none
 client-firewall none
 client-access-rule none
 webvpn
  functions url-entry
  html-content-filter none
  homepage none
  keep-alive-ignore 4
  http-comp gzip
  filter none
  url-list none
  customization value DfltCustomization
  port-forward none
  port-forward-name value Application Access
  sso-server none
  deny-message value Login was successful, but because certain criteria have not been met or due to some specific group policy, you do not have permission to use any of the VPN features. Contact your IT administrator for more information
  svc none
  svc keep-installer installed
  svc keepalive none
  svc rekey time none
  svc rekey method none
  svc dpd-interval client none
  svc dpd-interval gateway none
  svc compression deflate
group-policy xxxxx internal
group-policy xxxxx attributes
 wins-server value 10.215.77.1
 dns-server value 10.215.77.1 4.2.2.2
 vpn-tunnel-protocol IPSec l2tp-ipsec 
 split-tunnel-policy tunnelspecified
 split-tunnel-network-list value xxxxxx_splitTunnelAcl
 default-domain value xxxxxx.Local
 split-dns value xxxxx.Local 
username Terry password xxxxxxxxxxxxxxxxx encrypted privilege 5
username admin password xxxxxxxxxxxxxxx encrypted privilege 15
username Melinda password xxxxxxxxxxxx encrypted privilege 5
aaa authentication enable console LOCAL 
aaa authentication http console LOCAL 
aaa authentication serial console LOCAL 
aaa authentication telnet console LOCAL 
aaa authorization command LOCAL 
http server enable
http HFS1 255.255.255.255 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
auth-prompt prompt Authorized Personel Only! 
auth-prompt accept Authentication Accepted@! 
auth-prompt reject Please Try Again. 
crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac 
crypto dynamic-map outside_dyn_map 20 set pfs 
crypto dynamic-map outside_dyn_map 20 set transform-set ESP-3DES-SHA
crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map
crypto map outside_map interface outside
crypto isakmp enable outside
crypto isakmp policy 10
 authentication pre-share
 encryption 3des
 hash md5
 group 2
 lifetime 86400
crypto isakmp policy 30
 authentication pre-share
 encryption 3des
 hash sha
 group 2
 lifetime 86400
crypto isakmp nat-traversal  20
tunnel-group DefaultL2LGroup ipsec-attributes
 pre-shared-key xxxxxx
tunnel-group DefaultWEBVPNGroup webvpn-attributes
 nbns-server 10.215.76.1 master timeout 2 retry 2
tunnel-group Harvego type ipsec-ra
tunnel-group Harvego general-attributes
 address-pool xxxxxxx
 default-group-policy xxxxxx
tunnel-group Harvego ipsec-attributes
 pre-shared-key xxxxxx
telnet HFS1 255.255.255.255 inside
telnet timeout 5
ssh timeout 5
console timeout 0
management-access inside
dhcpd auto_config outside
!
 
!
class-map inspection_default
 match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
 parameters
  message-length maximum 512
policy-map global_policy
 class inspection_default
  inspect dns preset_dns_map 
  inspect ftp 
  inspect h323 h225 
  inspect h323 ras 
  inspect rsh 
  inspect rtsp 
  inspect sqlnet 
  inspect skinny 
  inspect sunrpc 
  inspect xdmcp 
  inspect sip 
  inspect netbios 
  inspect tftp 
!
service-policy global_policy global
webvpn
 port 444
 enable outside
 csd image disk0:/securedesktop-asa-3.1.1.29-k9.pkg
 csd enable
 url-list xxxxxxxxx-Urls "HFS1" cifs://10.215.76.1 1
privilege cmd level 3 mode exec command perfmon
privilege cmd level 3 mode exec command ping
privilege cmd level 3 mode exec command who
privilege cmd level 3 mode exec command logging
privilege cmd level 3 mode exec command failover
privilege show level 5 mode exec command running-config
privilege show level 3 mode exec command reload
privilege show level 3 mode exec command mode
privilege show level 3 mode exec command firewall
privilege show level 3 mode exec command interface
privilege show level 3 mode exec command clock
privilege show level 3 mode exec command dns-hosts
privilege show level 3 mode exec command access-list
privilege show level 3 mode exec command logging
privilege show level 3 mode exec command ip
privilege show level 3 mode exec command failover
privilege show level 3 mode exec command asdm
privilege show level 3 mode exec command arp
privilege show level 3 mode exec command route
privilege show level 3 mode exec command ospf
privilege show level 3 mode exec command aaa-server
privilege show level 3 mode exec command aaa
privilege show level 3 mode exec command crypto
privilege show level 3 mode exec command vpn-sessiondb
privilege show level 3 mode exec command ssh
privilege show level 3 mode exec command dhcpd
privilege show level 3 mode exec command vpn
privilege show level 3 mode exec command blocks
privilege show level 3 mode exec command uauth
privilege show level 3 mode configure command interface
privilege show level 3 mode configure command clock
privilege show level 3 mode configure command access-list
privilege show level 3 mode configure command logging
privilege show level 3 mode configure command ip
privilege show level 3 mode configure command failover
privilege show level 5 mode configure command asdm
privilege show level 3 mode configure command arp
privilege show level 3 mode configure command route
privilege show level 3 mode configure command aaa-server
privilege show level 3 mode configure command aaa
privilege show level 3 mode configure command crypto
privilege show level 3 mode configure command ssh
privilege show level 3 mode configure command dhcpd
privilege show level 5 mode configure command privilege
privilege clear level 3 mode exec command dns-hosts
privilege clear level 3 mode exec command logging
privilege clear level 3 mode exec command arp
privilege clear level 3 mode exec command aaa-server
privilege clear level 3 mode exec command crypto
privilege cmd level 3 mode configure command failover
privilege clear level 3 mode configure command logging
privilege clear level 3 mode configure command arp
privilege clear level 3 mode configure command crypto
privilege clear level 3 mode configure command aaa-server
prompt hostname context 
Cryptochecksum:25cda6e063576de4d8b72cc8b97ad819
: end

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Asked On: 2009-07-10 at 10:59:15ID24560773
Topics: Network Routers
,; Networking Hardware Firewalls
Participating Experts: 1
Points: 0
Comments: 8

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Answers

by: MikeKanePosted on 2009-07-10 at 11:16:42ID: 24825938

Step 1: Does this work from inside the network? Have you tested and is it successful?

Step 2: Is this an email server you are trying to get to? CAn you test the http port with a web page or something else?

Step 3: If the ASA is blocking anything at all, it would show in the logs. Use the ASDM, console, or a syslog server to view the logs and check for dropped packets etc...

Your ASA has an inspection policy that covers:
class inspection_default
inspect dns preset_dns_map
inspect ftp
inspect h323 h225
inspect h323 ras
inspect rsh
inspect rtsp
inspect sqlnet
inspect skinny
inspect sunrpc
inspect xdmcp
inspect sip
inspect netbios
inspect tftp

IF you still want to eliminate the inspection map you can disable it by using:
http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_tech_note09186a008085283d.shtml
Similiar to 'no service-policy global_policy global'

by: piotrmikula108Posted on 2009-07-13 at 10:23:31ID: 24841857

Hello

I don't think I can really test it from inside as it will force a local connection and not a RPC over HTTP

Yes, it's an email server, Small Business Server. I'm able to access thru webmail on port 443.

Don't see any dropped packets only

This is the entire TCP conversation I can see in logs

6      Jul 13 2009      08:00:39      302014      66.205.148.233      HFS1       Teardown TCP connection 2871106 for outside:66.205.xxx.xxx/4722 to inside:HFS1/443 duration 0:00:00 bytes 4718 TCP FINs

6      Jul 13 2009      08:00:39      302014      66.205.xxx.xxx      HFS1       Teardown TCP connection 2871107 for outside:66.205.xxx.xxx/4723 to inside:HFS1/443 duration 0:00:00 bytes 4683 TCP FINs

6      Jul 13 2009      08:00:39      302013      66.205.xxx.xxx      HFS1       Built inbound TCP connection 2871107 for outside:66.205.xxx.xxx/4723 (66.205.xxx.xxx/4723) to inside:HFS1/443 (63.207.xxx.xxx/443)

6      Jul 13 2009      08:00:38      302013      66.205.xxx.xxx      HFS1       Built inbound TCP connection 2871106 for outside:66.205.xxx.xxx/4722 (66.205.xxx.xxx/4722) to inside:HFS1/443 (63.207.xxx.xxx/443)

let me know if you have any other ideas

thank you so much

by: MikeKanePosted on 2009-07-13 at 10:32:14ID: 24841931

When you try to connect, what are you seeing? It looks to me like the ASA is passing the traffic ok....

by: piotrmikula108Posted on 2009-07-13 at 10:55:25ID: 24842124

first of all, I'm unable to configure RPC over HTTP in Outlook, and then I'm unable to even to OWA to that users mailbox, however I'm able to OWA as administrator to the server but not RPC/HTTP

strange

by: piotrmikula108Posted on 2009-07-13 at 11:47:08ID: 24842643

I'm getting this when I tun a test from this website https://testexchangeconnectivity.com/

Testing RPC/HTTP connectivity
     RPC/HTTP test failed
      Test Steps

      Attempting to Resolve the host name mail.harvego.com in DNS.
     Host successfully Resolved
      Additional Details
     IP(s) returned: 63.207.xxx.xxx
      Testing TCP Port 443 on host mail.xxxxx.com to ensure it is listening/open.
     The port was opened successfully.
      Testing SSL Certificate for validity.
     The certificate passed all validation requirements.
      Test Steps

      Validating certificate name
     Successfully validated the certificate name
      Additional Details
     Found hostname mail.xxxx.com in Certificate Subject Common name
      Validating certificate trust
     Certificate is trusted and all certificates are present in chain
      Additional Details
     The Certificate chain has be validated up to a trusted root. Root = E=info@valicert.com, CN=http://www.valicert.com/, OU=ValiCert Class 2 Policy Validation Authority, O="ValiCert, Inc.", L=ValiCert Validation Network
      Testing certificate date to ensure validity
     Date Validation passed. The certificate is not expired.
      Additional Details
     Certificate is valid: NotBefore = 11/21/2008 3:12:41 PM, NotAfter = 12/14/2011 11:02:15 AM
      Testing Http Authentication Methods for URL https://mail.xxxxxx.com/rpc/rpcproxy.dll
     Http Authentication Test failed
      Additional Details
     Exception Details:
Message: The underlying connection was closed: The connection was closed unexpectedly.
Type: System.Net.WebException
Stack Trace:
at System.Net.HttpWebRequest.GetResponse()
at Microsoft.Exchange.Tools.ExRca.Tests.HttpAuthMethodsTest.GetSupportedHttpAuthMethods()
at Microsoft.Exchange.Tools.ExRca.Tests.HttpAuthMethodsTest.PerformTestReally()

hmmmm.

by: MikeKanePosted on 2009-07-14 at 10:31:22ID: 24851992

Since it doesn't look like a firewall issue from the logs I see, this might be a little out of my area.

Have you seen this page:
http://www.msexchange.org/tutorials/Troubleshooting-RPC-over-HTTPS-Part1.html

by: piotrmikula108Posted on 2009-07-14 at 11:10:19ID: 24852397

your advise actually helped me rule out that it's indeed not a FW problem, thank you. Something broke on the server and I needed to rerun the Internet Connection Wizard on the SBS box. That restored everything to original settings.

by: MikeKanePosted on 2009-07-14 at 11:22:43ID: 24852514

Well, I'm glad its working for you then.... Happy to help.

20120131-EE-VQP-002

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URGENT: Unable to RPC over HTTP thru a Cisco ASA

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