Outlook OWA internally coonection issues Cisco ASA 5510

Dear All,

I am having issues inside my LAN where I cannot connect to our OWA (well the first 10 users do and then it fails, the same for their Outlook Anywhere connection). We have a Cisco ASA 5510, and there are no denies, our IP address is not blacklisted, and we can do a trace form the ASA box to the webmail IP address with no failure. (I had Cisco on the phone and it all connected fine from their traces). The outlook clients all fail after it hits 10 clients and we get no email, and then we cannot get to OWA from these clients.

It's really strange, as we can connect ot OWA and Outlook anywhere from outside on any other Internet connection.

We have wiped the ASA 5510 and gone to a basic config, and we are still having problems. I even put an old Cisco box in and this failed as well, same issues.

I cannot see the Exchange side of this so I do not know what has happened, but I am told the IP address for webmail has changed.

We have a separate wireless line and we can connect fine.

Has anyone else seen this?

We have tried to connect from the firewall (on a laptop) to the web address and we can get to the webmail fine, its just from the internal network behind the ASA Cisco box where it  around 10 client PC's connect, and can get to webmail, but after a certain amount of connections the new clients all fail.

We will try a different firewall.

Any help please?
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Can the people beyond the first 10 access anything else when they can't get to OWA/OA?

Can you post the results of sh ver?

I know you've got the 5510, but the 5505 has a version that only supports 10 inside hosts and blocks any subsequent hosts beyond that 10.

Where's the OWA/OA hosted?

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.