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Thanks to bbao and Bembi.<br />
Ill try your advice and feedback asap.
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Thanks to bbao and Bembi.
Ill try your advice and feedback asap.

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I've requested that this question be deleted for the following reason:<br />
<br />
Neglected status
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I've requested that this question be deleted for the following reason:

Neglected status

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So, where is the feedback asap?
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Our client application works fine on Windows XP.<br />
The application scans approx 10 registers without failures at a scan rate of 100 milli secs.<br />
When used on Windows 7 the app works for a few seconds and is then unusable.<br />
If the scan rate is decreased to 10 seconds the app works without failures<br />
If a scan rate of 2.5 seconds is used some failures are noticed.<br />
<br />
The link <a href="http://modbus.control.com/thread/1341225864" rel="ugc">http://modbus.control.com/thread/1341225864</a>&nbsp;refers to many similar issues. <br />
However a fix suggested below did not work.<br />
netsh interface tcp set global autotuninglevel=disabled<br />
<br />
Please advise.<br />
<br />
Help moderator please... I would like to increase the points 1000 but &quot;Edit question&quot; doesn't allow ??
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Our client application works fine on Windows XP.
The application scans approx 10 registers without failures at a scan rate of 100 milli secs.
When used on Windows 7 the app works for a few seconds and is then unusable.
If the scan rate is decreased to 10 seconds the app works without failures
If a scan rate of 2.5 seconds is used some failures are noticed.

The link http://modbus.control.com/thread/1341225864 refers to many similar issues. 
However a fix suggested below did not work.
netsh interface tcp set global autotuninglevel=disabled

Please advise.

Help moderator please... I would like to increase the points 1000 but "Edit question" doesn't allow ??

Modbus TCP client fails on Windows 7 --- works fine on XP

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functionality of the operating system. The best known frameworks are the TCP/IP model and the OSI model. Systems typically do not use a single protocol to handle a transmission. Instead they use a set of cooperating protocols, sometimes called a protocol family or protocol suite.[9] Some of the best known protocol suites include: IPX/SPX, X.25, AX.25, AppleTalk and TCP/IP. Other protocols indirectly related to networking include the hypertext transfer protocol (HTTP) and its related technologies, Dynamic Host Configuration Protocol (DHCP), Domain Name Server (DNS) and other Internet protocols.

Networking Protocols

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.