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New Member

Firewall Blocking Website without manual input

Our firewall appears to be blocking a website without us setting it to block it. We only have basic threat detection enabled, but it seems the firewall did this on it's own, and we cannot find where to unblock the website.

Anyone have any tips for new users?




Hello, Can you tell us what


Can you tell us what is the model number for your firewall?

Also, it may be good for you to check the MTU size and make sure it is the correct one for your network.

I hope this helps

New Member

It is the 5540. Running ASDM

It is the 5540. Running ASDM 6.3

We have never had this issue in the past, and someone was even accessing the website last week. He was doing a lot of little transmits to it, and then when we went back to access the site we haven't been able to. It's not on our ISP or their ISP, nothing is blacklisted, and when we use a web proxy we are able to get to it, which makes it the firewall for sure.

Thanks for the Response!


Thanks for the information

Thanks for the information.

Unfortunately you posted on the wrong forum.

I would try this one:

or this one:

This forum is meant for Small Business units, so you may not be reaching the right audience to get the best answers for your issue

I hope this helps

New Member

Will do, thanks!

Will do, thanks!

Share me your ASA device

Share me your ASA device configuration , Suspecting NATing issue for user LAN subnet





New Member

I'm sorry, but what exactly

I'm sorry, but what exactly do you want me to do?

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