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VPN Client stops communicating frequently

Posted on 2014-01-27
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Last Modified: 2014-02-12
Dear Experts,

I have an Cisco ASA 5540 Firewall and its configured with Remote Access VPN. Remote client uses Cisco VPN client

I am facing an weird issue.

One of the client have an access to specific server and I have lock down with ACL to access only this server.

The VPN client suddenly stops communicating with server. I cannot ping.

After my troubleshooting I have discovered, when the VPN client receives the same IP address from ASA such as 192.168.1.1..it will not work

When I changed to 192.168.1.2..it will for sometime then stops. Again I need to change the IP to 192.168.1.3 and so.

Having said that, I can ping to other servers ( by changing the ACL) but cannot ping to this server.

The server Oracle Linux

I would highly appreciate any help.

Thanks
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Question by:cciedreamer
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Expert Comment

by:MAG03
ID: 39816359
I have seen something similar when the VPN pool was used up, then random VPN clients would have connectivity one minute and the next they would be kicked out.

Does this only happen with the one server? or can you reproduce the issue with other servers? Is it just from the one client or is it all clients that connect to that one server?  How long do you have connectivity before you lose it? is it the same length of time each time?

Also, if possible, could you post a full sanitised running configuration? there might be a configuration issue with the ASA also.
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Author Comment

by:cciedreamer
ID: 39816939
Thanks.

Its happening only with this server and the time varies for disconnection may 10-15,1 hour, 2 hour or 1 day.
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Author Comment

by:cciedreamer
ID: 39816951
The VPN client doesn't get disconnect it just pinging to the server and eventually no access.

Thanks
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LVL 17

Expert Comment

by:MAG03
ID: 39817556
Is it just from the one client or is it all clients that connect to that one server?
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Author Comment

by:cciedreamer
ID: 39817584
Its happening with all clients connecting to this server.

Thanks
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Accepted Solution

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MAG03 earned 500 total points
ID: 39817586
If it is just that one server and all clients have the same issue but not with other servers, then (without seeing your ASA configuration) I would say there is an issue with that particular server.
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by:cciedreamer
ID: 39855381
The issue was with the server configuration.

Thanks for the help
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PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

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