Putty Problem to One Linux Server

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I am having a problem with Putty 0.58 that I have not run into before
and I have been using it for years.   I have three computers.  On one
the OS is Windows XP Pro with Putty.  The other two are servers running
Slackware with OpenSSH_5.3p1, OpenSSL 0.9.8l 5 Nov 2009

If I connect to server A from the XP desktop using Putty, I obtain a
connection that is rock solid and it will stay up for hours until I
manually disconnect.  If I connect to server B using the same desktop
computer and Putty, it disconnects after about 5 minutes with the error
message "Network error: Software caused connection abort". If I try to
connect again right after it disconnects, I receive a "Network error:
Connection Refused" message.  If I wait a bit, I am however able to
establish a new connection with no error message.   It is also
interesting to note that if I have two Putty sessions running from XP to
server B, they both die at the same time and continuous 1 second pings
from server A to server B never miss a beat.

Lastly, when the connection dies between Putty and server B, if I also
have a Putty session running to server A it is not affected.  And if I
have an ssh connection between server A and server B that is initiated
from a command line, it also is not affected.   Simultaneous connections
between server A and server B are rock solid, connections between Putty
and server A are rock solid, but connections between Putty and server B
cannot be maintained.

The only difference I can think of between the two server setups is that
server B is the only one with a 100 MB connection.  The other two are 1
GB connections with a single switch (HP-J9029A) in between all of them.

Most of what I have read indicates the "Software caused a connection
abort"  is the result of  a Windows network problem but with the Server
A connection being so solid, I am at a loss as to why it works in one
case but not the other.  Any suggestions?  Thanks.

Re: Putty Problem to One Linux Server

nospam@notreal.com says...
Quoted text here. Click to load it

I thought I would post this in case someone else ever had a similar
headache since I found the problem - pilot error.  In other words, I was
an idiot.  After much gnashing of the teeth, I found another device on
the network with the same static IP address I used for server B. I had
installed the device months ago and forgotten about it. I guess that
says something about the need for good record keeping.  

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