ASA 5510 closing RDP session by inspection?

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May 20th, 2010
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I'm a little confused by this one.  What would case the default inspection policies to close RDP sessions due to inspection?



6May 20 201015:40:05302014172.20.0.354938810.1.0.2003389Teardown TCP connection 708656 for VPN-DMZ:172.20.0.35/49388 to VPN-Trusted:10.1.0.200/3389 duration 0:00:00 bytes 2690 Flow closed by inspection (USERNAME)



I only have the default inspections configured.



policy-map type inspect dns migrated_dns_map_1
parameters
  message-length maximum 512
policy-map global_policy
class inspection_default
  inspect dns migrated_dns_map_1
  inspect ftp
  inspect h323 h225
  inspect h323 ras
  inspect rsh
  inspect rtsp
  inspect esmtp
  inspect sqlnet
  inspect skinny 
  inspect sunrpc
  inspect xdmcp
  inspect sip 
  inspect netbios
  inspect tftp
  inspect ip-options
!


Also I see no drops on the service policy


sh service-policy

Global policy:
  Service-policy: global_policy
    Class-map: inspection_default
      Inspect: dns migrated_dns_map_1, packet 12, drop 0, reset-drop 0
      Inspect: ftp, packet 0, drop 0, reset-drop 0
      Inspect: h323 h225 _default_h323_map, packet 0, drop 0, reset-drop 0
               tcp-proxy: bytes in buffer 0, bytes dropped 0
      Inspect: h323 ras _default_h323_map, packet 0, drop 0, reset-drop 0
      Inspect: rsh, packet 0, drop 0, reset-drop 0
      Inspect: rtsp, packet 0, drop 0, reset-drop 0
               tcp-proxy: bytes in buffer 0, bytes dropped 0
      Inspect: esmtp _default_esmtp_map, packet 0, drop 0, reset-drop 0
      Inspect: sqlnet, packet 0, drop 0, reset-drop 0
      Inspect: skinny , packet 0, drop 0, reset-drop 0
               tcp-proxy: bytes in buffer 0, bytes dropped 0
      Inspect: sunrpc, packet 0, drop 0, reset-drop 0
               tcp-proxy: bytes in buffer 0, bytes dropped 0
      Inspect: xdmcp, packet 0, drop 0, reset-drop 0
      Inspect: sip , packet 0, drop 0, reset-drop 0
               tcp-proxy: bytes in buffer 0, bytes dropped 0
      Inspect: netbios, packet 29, drop 0, reset-drop 0
      Inspect: tftp, packet 0, drop 0, reset-drop 0
      Inspect: ip-options _default_ip_options_map, packet 0, drop 0, reset-drop 0

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Jennifer Halim Thu, 05/20/2010 - 14:26
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  • Cisco Employee,

It's actually closed by the default TCP inspection of the firewall, not part of the application specific inspection.


Here is that particular syslog message# 302014 for your reference:

http://www.cisco.com/en/US/docs/security/asa/asa80/system/message/logmsgs.html#wp4770614


"show asp drop" might show the reason of why it's being dropped. You might want to clear the asp drop counters, then trigger the error if possible, and "show asp drop".


Hope that answers your question.

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