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Cat6509 unresponsive issue

Hi All


Equipment is 2x Catalyst 6509  WS-C6509 (R7000) processor (revision 3.0) with 458752K/65536K bytes of memory.

(s222_rp-ADVIPSERVICESK9_WAN-M),  Version 12.2(18)SXF17a, RELEASE SOFTWARE (fc1)running FWSM on both  firewalls in active/standby mode.


Hardware:   WS-SVC-FWM-1, 1024 MB RAM, CPU Pentium III 1000 MHz

Flash STI Flash 7.2.0 @ 0xc321, 20MB.


Running  external DMZ for customers with voice services and MS Lync services on  FWSM. The FWSM became unresponsive from time to time.ADSM connection to  FWSM was lost same as continual PING from inside network to inside  interface. Pings were timeout 10times and then started again work and  this repeated continually.

From logs on c6509 and FW we couldn’t see any failures or warnings so we have continued troubleshooting in Local network.

We have found that from Cisco and linux boxes the ping to FW inside interface is ok, only from Windows boxes ping is affected.

This  leaded us to idea that MTU might bet the problem. But MTU was setup  1530 on LAN so that was not the case. We decided to failover FWSM to  secondary unit by “no failover active command” run on active unit, but  this didn’t fix the issues, connectivity from outside to DMZ and also  from inside to FW still was not responding. 


We decided lastly to reload  the 6509 - after doing so everything was fine.  We just need an  explanation as to what caused the issue please...


Please find attached a pcap trace and tech supports from FWSM and 6509.  Also there are logs after the reload.


Many thanks and best regards


David McCann

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