Applies to:

Windows Server 2008 R2 RTM

Note:  You should check http://support.microsoft.com for the latest version of the different files.

List of Network related hotfixes post RTM for Windows Server 2008 R2 as of April 2011:

2525390 The SACK option is always set to "true" even if network adapter does not support SACK for offloaded connections in Windows 7 or in Windows Server 2008 R2
http://support.microsoft.com/?id=2525390
Update(s):
Tcpip.sys
Fwpkclnt.sys

Supersedes:
2521175
2519736
2519644
2511305
2477730
2472264
2470853
2465772
2386184
2381191
2344959
2175609
20228625
983528 The TCP receive window autotuning feature does not work correctly in Windows Server 2008 R2 or in Windows 7
981889 A Windows Filtering Platform (WFP) driver hotfix rollup package is available for Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2
981889
981180
981344
979612
979223
978886
978622
977342
977067
976527

2028827 The applications that use the TDI driver for network traffic may stop responding in Windows Server 2008 R2 or in Windows 7
Update(s):
Tdx.sys  6.1.7600.20713

Supersedes:
981344
978622

981889 A Windows Filtering Platform (WFP) driver hotfix rollup package is available for Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2
http://support.microsoft.com/?id=981889
Update(s):
Netio.sys

Supersedes:
981889
981275
979223 A nonpaged pool memory leak occurs when you use a WFP callout driver in Windows Vista, Windows 7, Windows Server 2008, or in Windows Server 2008 R2
978886
976759
974598

2508429
2492806 A Windows Vista-based, Windows Server 2008-based, Windows 7-based or Windows Server 2008 R2-based computer that shares some files and some folders may not respond to file share requests
http://support.microsoft.com/?id=2492806
Update(s):
Srv.sys

Supersedes:
982214
980135
975512 Some SMB clients cannot access cluster file shares but they can access non-cluster file shares that are located on a computer that is running Windows Server 2008 or Windows Server 2008 R2
971468
951418

2508429 MS11-020: Vulnerabilities in SMB Server could allow remote code execution: April 12, 2011
http://support.microsoft.com/?id=2508429
Update(s):
Srv2.sys

Supersedes:
2493869
2492806
2473205
2394911

2508429 MS11-020: Vulnerabilities in SMB Server could allow remote code execution: April 12, 2011
http://support.microsoft.com/?id=2508429
Update(s):
srvnet.sys


Supersedes:
2492806
982214
980135
971468

2511455 MS11-019: Vulnerabilities in SMB Client could allow remote code execution: April 12, 2011
http://support.microsoft.com/?id=2511455
Update(s):
Mrxsmb.sys


Supersedes:
2473205
2029054
983458
982860
980232

2511455 MS11-019: Vulnerabilities in SMB Client could allow remote code execution: April 12, 2011
http://support.microsoft.com/?id=2511455
Update(s):
Mrxsmb10.sys


Supersedes:
2473205
2444558
2444328
2194664
2064460
983458 You cannot save documents to a folder or change the permission settings of folders on a SMB 1.0-based remote server from a Windows-based computer that has security update 980232 (MS10-020) installed
980232
978251

2511455 MS11-019: Vulnerabilities in SMB Client could allow remote code execution: April 12, 2011
http://support.microsoft.com/?id=2065362
Update(s):
Mrxsmb20.sys


Supersedes:
2494418
2473205
2065362 An application which calls the ReadFile function on a named pipe server may stop responding when you run the application on a computer that is running Windows Vista, Windows Server 2008, Windows 7 or Windows Server 2008 R2 2029054
2028965
982860 A computer that is running Windows 7 or Windows Server 2008 R2 takes four minutes to open a Microsoft Office 2003 document from a network share
981711
980232
978251

2434932 Temporary files do not synchronize correctly to a non-DFS share on a server from a client computer that is running Windows 7 or Windows Server 2008 R2
http://support.microsoft.com/?id=2434932
Update(s):
Rdbss.sys


Supersedes:
2265716 A computer that is running Windows Server 2008 R2 or Windows 7 stops responding randomly
    Note:  Not a rdbss.sys hotfix but speaks about a deadlock
2254637 "0x0000007F" Stop error occurs when the connection to some shared files is lost on a computer that is running Windows Vista, Windows Server 2008, Windows 7 or Windows Server 2008 R2
981872 Access to a redirected folder or a home drive disconnects regularly on a computer that is running Windows Server 2008 R2 and Windows 7
981711
980663
980232
978251

983620 You cannot access a DFS share through a mapped network drive on a computer that is running Windows 7 or Windows Server 2008 R2
http://support.microsoft.com/?id=983620
Update(s):
Dfsc.sys 6.1.7600.20714

2401588 Remote procedure call service crashes on a computer that is running Windows Server 2003 SP2, Windows Vista, Windows Server 2008, Windows 7 or Windows Server 2008 R2
http://support.microsoft.com/?id=2401588
Update(s):
Rpcss.dll

2457402 You experience delays with an application or service that uses NTDSA APIs for passing changes from RWDC data centers to RODC data centers
http://support.microsoft.com/?id=2457402
Update(s):
rpcrt4.dll

Supersedes:
2401588 Remote procedure call service crashes on a computer that is running Windows Server 2003 SP2, Windows Vista, Windows Server 2008, Windows 7 or Windows Server 2008 R2
979150 RPC function error in Windows Server 2008 R2 and in Windows 7: "0x0000000E RPC_S_OUT_OF_MEMORY"

2529956 Windows Server 2008 R2 installation may hang if more than 64 logical processors are active
http://support.microsoft.com/?id=2529956
Update(s):
ndis.sys


Supersedes:
2482122
2471472 An NDIS device cannot be failed over on a fault-tolerant system that is running Windows 7 or Windows Server 2008 R2 after you suddenly remove another NDIS device
981765 The network performance is not as fast as expected on a computer that has NUMA-based processors and that is running Windows Server 2008 R2 or Windows 7
977977 RSS network throughput performance decreases on Windows Server 2008 R2-based computers that have more than 32 processors
976373 A computer that is connected to an IEEE 802.1X authenticated network through a VOIP phone does not connect to the correct network after you resume it from Hibernate mode or Sleep mode

967891 Error message when you use applications that are based on legacy Transport Driver Interface (TDI) filter drivers on a computer that is running Windows 7 Beta or Windows Server 2008 R2: "STOP 0x000000D1
http://support.microsoft.com/?id=967891
Update(s):
afd.sys


2550576 STOP 0xC4 may occur in tcpipreg.sys following a reboot after Driver Verifier is enabled on Windows 7 SP1 or Windows Server 2008 R2 SP1
http://support.microsoft.com/?id=2550576
Update(s):
tcpipreg.sys

Supersedes:
2470853
2386184
981889
979612
978886