Solved

RDP problems over Netscreen 5GT

Posted on 2009-04-09
9
1,117 Views
Last Modified: 2013-11-21
Hello,

In one of our offices we have two completely separate networks (due to business reasons this has to be the case), Network A & Network B.  Between the two networks I have placed a Netscreen 5GT to allow some traffic to pass between the two.  Some users from Network A need to RDP to a server in Network B.

The RDP session kicks off fine and allows the user to connect to the sever, however, after only a few seconds the session disconnects.  Some of these users are on XP, others are on thin client Winterms.  

I can run a constant ping from A to B without any drops.  Going in the opposite direction, ping is also constant and Citrix works flawlessly.  Unfortunately there are no Citrix farms on Network B so it has to be RDP into the terminal sever.  

Users on Network B can RDP into the server without any problems.  So it appears to me that the problem lies in the Netscreen, but I open to all suggestions.  

I did wonder if it could be a problem with MTU size.  I tried reducing it to 1300 on the Netscreen but it made no difference.   I have seen in some places that the MTU needs to be set on the client machine, but as some of the users are on Winterm thin clients, I don't think this can be configured.  But I fully admit I know very little about MTU so I am open to any suggestions.

Kind regards
0
Comment
Question by:laytonblackham
9 Comments
 
LVL 8

Expert Comment

by:MrMintanet
ID: 24107922
Connect the TS to a switch.  Connect the switch to the DMZ port of each separate network.

Then setup policies to only allow port 3389 through.
0
 

Author Comment

by:laytonblackham
ID: 24108402
MrMintanent - thank you for your response.
The policy on the netscreen is already allowing 3389 though, so will this make a difference to the problems I'm getting with the session disconnecting?

Thanks
0
 
LVL 8

Expert Comment

by:MrMintanet
ID: 24108415
Have you tried to lower the connection speed to 16 bit color, etc?
0
Optimizing Cloud Backup for Low Bandwidth

With cloud storage prices going down a growing number of SMBs start to use it for backup storage. Unfortunately, business data volume rarely fits the average Internet speed. This article provides an overview of main Internet speed challenges and reveals backup best practices.

 

Author Comment

by:laytonblackham
ID: 24108512
No, I haven't actually - I'll try that this afternoon.  

Thanks
0
 

Author Comment

by:laytonblackham
ID: 24139103
Hi, back after the bank holiday weekend.

Even with 256 colours and reduced display resolution I get the same issues.  

Thanks
0
 

Author Comment

by:laytonblackham
ID: 24146277
Raising the points to 500 in the hope that someone can help me.  Thanks!
0
 
LVL 2

Accepted Solution

by:
sfrancy earned 500 total points
ID: 24221342
I have seen this problem occur with an asymmetric routing situation.  This is where the routed path from network A -> B is not the same as B ->A.  If you have this situation, you can fix the routing problem or you can try issuing this command:  unset flow tcp-syn-check.

0
 

Author Comment

by:laytonblackham
ID: 24226264
Sfrancy, thank you very much for the response.
I've not had chance to try this today but will do on Monday.

Thanks
0
 

Expert Comment

by:trojan81
ID: 34518273
Did "unset flow tcp-syn-check" resolve the issue?
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Welcome to my series of short tips on migrations. Whilst based on Microsoft migrations the same principles can be applied to any type of migration. My first tip Migration Tip #1 – Source Server Health can be found here: http://www.experts-exchang…
Remote Apps is a feature in server 2008 which allows users to run applications off Remote Desktop Servers without having to log into them to run the applications.  The user can either have a desktop shortcut installed or go through the web portal to…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

821 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question