1
vote
1answer
92 views

TCP syn cookie calculation on Windows Server

Windows Server uses uses TCP syn cookies to protect itself from syn-flooding attacks. Is it known, how the operating system (Windows Server 2008 R2 and Windows Server 2012) calculates the syn cookie? ...
2
votes
1answer
446 views

How to tune Windows 2008r2 and IIS to maximize single file download speeds?

We recently put up an IIS site (on WinSvr 2008r2 running as a Hyper-V guest) that is used almost exclusively for downloading files over the internet. The data exists as a large collection of .zip ...
1
vote
2answers
5k views

Increasing of max (more than 10) TCP Connections

I have the following problem on one of my servers: On other servers max TCP Connections is dynamical and much more higher than 10. How to increase max TCP Connections in this server in Windows ...
0
votes
1answer
642 views

How to enable TCP/IPV4 disabled on LAN via command prompt [closed]

I have unchecked tcp/ipv4 protocol from LAN properties & now iam unable to access the server or connect remotely. However i have serial console access to the server where i can use netsh command. ...
-1
votes
1answer
262 views

How to collect TCP stats on Windows? For further NIC optimisation

I want to collect statistics on how big TCP packets are on incoming traffic. The box is Windows 2008 R2. I want to optimise NIC settings for the particulare shape of the traffic I have. Anything ...
3
votes
1answer
876 views

No TCP connections to hosts behind VPN server (SYN, SYN-ACK, but no ACK), UDP, ICMP works

I'm probably doing something incredibly stupid, but I just can't seem to figure out what. Here's what I'm trying to accomplish: I want remote users to be able to log into our network, so I set up a ...
1
vote
1answer
645 views

Windows Server 2008 Low Throughput on Internet Latency Connections

We have some windows servers (2008 R2) and we are experiencing a strange network issue on them. The best way that I can describe it is that we are experiencing low throughput (but high bandwidth) ...
0
votes
1answer
82 views

WebServer Performance Issue

Recently we moved to a new hosting infrastructure and our web site, every 30 min or so, comes to a halt and then recovers ... What we noticed by looking at the performance monitor is that while we ...
0
votes
4answers
6k views

Windows Server 2008 R2/IIS 7 refuses all outside tcp connections

I am unable to connect, for example, via http to a brand new installation of 64-bit Windows Server 2008. The server is on a domain, but is not DC (that's another problem altogether). The IIS7 is ...
3
votes
1answer
520 views

Where does TCP CPU load show up?

If connections on Windows 2008 R2 server are not being offloaded. Where does the CPU usage caused by processing TCP appear? So in taskmanager, does it show up as part of the process using the ...
1
vote
1answer
2k views

Can the RWIN (TCP Receive Window) be manually set in Windows Server 2008 R2?

Is there a way to manually set the receive window size (RWIN) in Windows Server 2008 R2 after disabling the "Receive Window Auto Tuning" feature?
4
votes
2answers
1k views

High Instances of Zero Window Messages

On my web servers I am seeing a high rate (106 over ~13 seconds or 300,000 packets) of zero window update messages sent form my web servers to my database servers during peak traffic. Firmware is ...