We have a bunch of Cisco 871 routers and after upgrading to the latest IOS (c870-advipservicesk9-mz.124-11.T2.bin); do to some of the problems with previous IOS versions (appfw consumming 100% CPU); we are experiencing a problem with 1 of the routers, where certain websites, including this one (forum.cisco.com)/www.msn.com/www.microsoft.com won't load and just time out.
I went through the config and removed all IP inspect rules and turned of appfw to see if this would solve it, but without any success.
I ran a packet scanner on the network to see what could be causing the block, and analyzing the output it seems that the sites in question are sending malformed packets via this router. Well at least it seems that the router is corrupting the packets. What is weird however is that it only does this for certain sites and not all.
Has anyone ever experienced this? Or any suggestions on how to go about solving this problem?
Please let me know