I have a very strange communication problem with one of my servers.
A hyper-v 2008 r2 with Autodesk Vault and Flexnet licensing server.
All clients gets reply on ping always, but connecting to services on the server are very unstable.
It's different clients that have connection problems from time to time,
The services we usually use are RDP-port 3389 and Autodesk licensing-port 2080 and 27000.
Either none or all services are answering at the same time. If we cant get a license, we can't connect to remote dektop either, and visa versa.
At the same time the guy on your side might connect to all services.
I have turned off fw on clients and server, removed all AV software, rebooted all servers clients and network hw.
The hyper-v server are hosting many other serves without this problem, and I have even tried to move the virtual server to another host.

Any suggestions how to troubleshoot this?

TorF

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Hi,
According to your description, I assume that only RDP and Autodesk licensing services has problem. What is the received error message when you cannot connect to the server via remote desktop? Does you server have multiple NICs installed? General speaking,
the RDP connection may blocked by local windows firewall or anti-virus, and network device between your client and server. Also, verify the relevant service is working normally. Check if there is any related error event log showing up. In addition, please
ensure the server has the latest Update installed. Also verify the network card driver is update to date.
Best Regards,
AidenAiden Cao
TechNet Community Support

There is an amazing pack of free network admin tools. click here to download it

Hi,
According to your description, I assume that only RDP and Autodesk licensing services has problem. What is the received error message when you cannot connect to the server via remote desktop? Does you server have multiple NICs installed? General speaking,
the RDP connection may blocked by local windows firewall or anti-virus, and network device between your client and server. Also, verify the relevant service is working normally. Check if there is any related error event log showing up. In addition, please
ensure the server has the latest Update installed. Also verify the network card driver is update to date.
Best Regards,
AidenAiden Cao
TechNet Community Support

There is an amazing pack of free network admin tools. click here to download it

Hello. Thank you for your reply.

The problem is not the services, all the services are working all the time, but from different clients.
It always works for some clients, but not always for all.
One guy can have problems connecting to the services, while it works perfect for the guy besides him.
Suddenly this can change to work for both og them, og for none.
Here is an example.
(I use paping.exe for ongoing port check. This is a brilliant app that let's you do continuous port check. Like a ping on ports)
Yesterday i could not connect from my own laptop to the server on a port level, which means no rdp or no connections to flexnet or other activce ports.
As usual I got reply on PING, as we always do on all clients.
I was connected with a cable, so I disconnected the cable, and enabled my wireless card. This immediately gave me replies on my ongoing port pings. Then I plugged back the cable, disabled the wifi, and the connection to the ports is now good with only the cable
connection.
This was just an example of the unlogical behaviour we experience.
The most usual example is the random user going home in the afternoon, and comes back the next day without connection to the services, while other guys still can use the services. Later the same day it might be another client having the same problem. And as
I have already mentioned - there is always a connection if you ping the server from any client, even from the clients that cannot connect to the open ports.
We have about 10+ servers running different services, and there is no issues similar to this on any of theese.
The network is one simple subnet 192.168.0.0/23
Since there is always a ping reply, I am thinking this must be something network related.
Is it not so that icmp ping goes on the network layer 3, and port related services goes on transport layer 4?
Could this be a lead? And if so - how do I troubleshoot this? I have of course rebooted all my network equipment.
I hope any of you can guide me in the right direction here, I'm pretty lost :-/

TorF

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