We have a web application which has virtually ground to a halt since Avast was installed on client PCs. Disabling web shield on those PCs fixes the problem. Only one web app has the problem. This app is developed using the Polar Studio IDE from Bluepolar. We are unsure what is unique about the behaviuor of this application.
Has anyone had any experience of this problem or have any idea how to fix this server side rather than having to disable web shield on multiple clients.
Thanks.
Steve
Is AJAX streaming or any other kind of live data streaming used in the Web App ?
Hi
I don’t think there is any Ajax or similar. From a packet trace, we just see a few GETs from the client for the initial page, then a GET for an ASP page followed by a long delay before additional GETs for some .asp and .js pages. There is a TCP Checksum incorrect message with the suggestion that this may be caused by “TCP checksum offload”. This delay happens a couple of times before the application login screen loads. Not sure if this is relevant or something about how Wireshark is capturing packets.
Steve
Hi,
it is hard to guess from the description. Is the site availble on the net, so I can test it?
WebShield works higher that the Transport layer of packets and TCP/IP. It does not see individual packets and can not modify its checksums.
Hi Lukor
Thanks for your comments so far.
The site is internal only, so unfortunately you cannot test.
Having done traces on working sites, and this site with Web Shield service turned off, the only differences are a number of 130-second gaps where no traffic is seen. Seems like this must be a timeout somewhere, but I haven’t found where yet. I don’t think it’s any of the IIS timeouts.
Steve