CHUNKINVALIDHDR error with a cisco 871

Answered Question
Sep 14th, 2010
User Badges:

Hi everybody,

i have a cisco 871 configured with a VPN, and it suddenly started writing out through console this message:

"%SYS-2-CHUNKINVALIDHDR: Invalid chunk header type 1 for chunk 83876948, data 838778AC -Process= "IP Input", ipl= 3, pid= 72,  -Traceback= 0x8084F720 0x80037078 0x8034D438 0x8170FA3C 0x8170D6AC 0x8170D978 0x816E6BD0 0x8190F7CC 0x8190468C 0x819048B8 0x8190FE74 0x80C13514 0x80C13DB8 0x80C15578 0x80C1560C 0x80C2DA5C".

I´ve found in google some information about chunk errors, but i think that´s not my case:

Symptoms: Sometimes WebVPN login page may not come up when a client  browser connects to the gateway. Sometimes, login page may come up, but  after entering the login credentials portal page does not come up. The  following syslog messages are seen.

1) We are able to enter the webvpn login page, but after entering the  username and password, the page returns the error message "Internal  Error" and does not let us login. Also, the traceback below is seen.

May 10 06:15:19.183 PDT: %SYS-2-CHUNKINVALIDHDR: Invalid chunk header type 0 for chunk 
0, data 0 -Process= "SSLVPN_PROCESS", ipl= 0, pid= 265, -Traceback= 0x61898E8C 
0x6002DFC4 0x63D802FC 0x63D70C64 0x63D78A5C 0x63D79054 0x63D7986C 0x63D736A8

2) The webvpn login page is not thrown up at all when we try to connect  to the webvpn gateway. The 'Page is not displayed' due to the following  Traceback

May 10 21:57:30.963 PDT: %SYS-2-CHUNKINVALIDHDR: Invalid chunk header type 0 for chunk 
0, data 0 -Process= "IP Input", ipl= 0, pid= 120, -Traceback= 0x61898E8C 0x6002DFC4 
0x63D6D564 0x63D72F48 0x63D5C804 0x62285B20 0x62288158 0x61F81940 0x61F83264 
0x61F8367C 0x61F83738 0x61F83980

Conditions: This can happen if WebVPN configuration is being removed and a client tries to connect.

Workaround: Avoid removing WebVPN configuration once it is configured

I don´t have any web vpn configuration. So, do you have any idea? The router is working perfectly but i am afraid for what could happen in the future.

Thanks in advance,


Correct Answer by vragotha about 6 years 9 months ago

The bug is fixed in 12.4(15)T12 or higher releases

This is more of a cosmetic issue.

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (1 ratings)
vragotha Tue, 09/14/2010 - 06:59
User Badges:
  • Silver, 250 points or more

Can you post a 'show version'

raul.wamba Tue, 09/14/2010 - 07:30
User Badges:


ROUTER_HOSTNAME#show version

Cisco IOS Software, C870 Software (C870-ADVIPSERVICESK9-M), Version 12.4(15)T10, RELEASE SOFTWARE (fc3)
Technical Support:
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Mon 14-Sep-09 23:35 by prod_rel_team

ROM: System Bootstrap, Version 12.3(8r)YI4, RELEASE SOFTWARE

ROUTER_HOSTNAME uptime is 6 days, 21 hours, 1 minute
System returned to ROM by power-on
System image file is "flash:c870-advipservicesk9-mz.124-15.T10.bin"

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to
[email protected].

Cisco 871 (MPC8272) processor (revision 0x300) with 118784K/12288K bytes of memory.
Processor board ID FHK1405712G
MPC8272 CPU Rev: Part Number 0xC, Mask Number 0x10
5 FastEthernet interfaces
128K bytes of non-volatile configuration memory.
28672K bytes of processor board System flash (Intel Strataflash)

Configuration register is 0x2102

Thanks a lot for your quick response.


raul.wamba Wed, 09/15/2010 - 02:25
User Badges:

Thank you!!

so, i´ll upgrade to T12 version

Thanks a lot!!


This Discussion

Related Content