cisco 2911 occasionally crash.

[zhendong xu]

Our company has a cisco 2911 for edge router .

It's version 

c2900-universalk9-mz.SPA.150-1.M5.bin.

It only has

nat, default route and some access-list

for it, .
recently  it occasionally crash, about once / two months.

could some help have a look at the crashinfo file .

Why the router crash?

Thanks.

[Leo Laohoo]

Not sure how "recent" but the crash info file was generated on 17 October 2021. 

By the way, the password is in plain text. 

[Kasun Bandara]

Hi

What you meant by crash?

is it restarting or shutting down?

check the logging details for identify the reason for restart or shutdown.

[zhendong xu]

the router restart and generate a crashinfo  file in the router's flash

[Leo Laohoo · Accepted solution]

---

@zhendong xu wrote:

%TCP-2-INVALIDTCB: Invalid TCB pointer: 0x31A1D664 -Process= "HTTP CORE"

---

Disable HTTP server.

How big is the WAN link? 

What other services does this router do, FW or UC?

By the way, the router is using IOS version 15.0(1)M5.  If I enter the IOS version into the IOS Software Checker, THIS is the result of known security vulnerabilities this router is exposed to.  

[zhendong xu]

thanks.

i will disable the http server.

The wan bandwith is only 50M.

there is no other service.   

only

NAT, default route, and some access-list.

[Leo Laohoo]

---

@zhendong xu wrote:

thanks.

i will disable the http server.

The wan bandwith is only 50M.

there is no other service.   

only NAT, default route, and some access-list.

---

Let me repeat my first response:  The crashinfo attached contains a password in plain text.  

Sanitize it before uploading for every man-and-his-dog to see.

[zhendong xu]

i have removed the plain password.

thanks

[Georg Pauwen]

Hello,

just out of curiosity, how did you resolve this ? What was the issue ?

[marce1000]

 - Have a go with latest advisory release :  https://software.cisco.com/download/home/282774227/type/280805680/release/15.7.3M8  , check if that can help.

 M.