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07.17.2008 at 04:15AM PDT, ID: 23572740
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6.4

ISA Server keeps dropping TELNET and other TCP/IP application sessions after 66 seconds

Asked by ricklyle in MS Forefront-ISA

Tags: , , ,

I have an ISA 2004 Std Ed Server with 2 NICS.  One internal and one connected to the Internet.  On the internal network I have a Cisco router connected to a client network via 256k leased line.  I have configured ISA to have our clients IP address range routed through this Cisco router.

The issue is that local PC clients on our local network keep getting their TELNET and other TCP/IP sessions dropped after 66-70 seconds.  However, we have at least two remote PC clients who access our network via VPN through the same ISA server and they do not get this problem, i.e. the VPN clients can keep TELNET and other TCP/IP applications open up continuously.  

I have tried to alter the TCP KeepAlive heartbeat and session time to 1 second and 2 hours consecutively with no success on the local PC clients.

I have attached an Excel spreadsheet showing my analysis of a "internal" and "VPN" PC Client extracted from the ISA log. Start Free Trial
Attachments:
 
ISA-Server-Log-Analysis.xls (23 KB) (File Type Details) 
ISA Server Log Analysis
 
 
Local-vs-VPN-Dropped-Connections.zip (8 KB) (File Type Details) 
ISA Server Logs (IIS format) renamed with postfix of TXT file extension
 
[+][-]07.20.2008 at 08:31AM PDT, ID: 22046053

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About this solution

Zone: MS Forefront-ISA
Tags: Microsoft, ISA Server, 2004, SP1
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Solution Provided By: ricklyle
Participating Experts: 1
Solution Grade: A
 
 
 
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20081112-EE-VQP-42 / EE_QW_2_20070628