Posts tagged "Windows"
IP Scan Between Microsoft Clients on Port :7680 ?
TL;DR: If you experience poor network performance on your wireless notebook, Microsoft may be using your device as a download server without your consent. Problem : I noticed a high number of requests between Windows clients in different network zones on a customer's firewall. It appeared that allmost every client w...
Windows / Linux Timezone Settings
Problem: if you have Windows and Linux on the same computer, windows shows the wrong time shifted by your timezone (dst) after rebooting from Linux. Discussion: Linux stores UTC in the computers hardware clock usually. This makes multi user, multi timezone, and dst handling easy, because it knows hardware clock is a...
Ping to Windows Server 2012 with Direct Access fails
Problem: Ping from Linux computers to Windows Server 2012 with Direct Access fails for hours (no response) although connectivity is working (eg. HTTPS) Discussion: Ping from other windows machines and Cisco machines worked, but from Linux machines ping was not answered. I tried to find the difference between those I...
WScale and Cisco Content Switch CSS.
Problem: Windows 7 clients wait 5 seconds to send simple HTTP requests to a web server behind a cisco CSS content switch. But there is no delay when the client connects directly to a web server behind the CSS. Description: I found one difference between CSS and non-CSS connects: the TCP WSCALE option. When the CSS i...
One Mouse and Keyboard for Two Computers
I just read that MircoSoft announced a "new" software to control two WindowsPCs with one keyboard and mouse. It might be new to MircoSoft but a software for this exists since about 1998. When I had both Linux and Windows on my desktop some years ago I used x2vnc for this. Read on: http://fredrik.hubbe.net/x2vnc.html
Windows Network Load Balancing NLB and Cisco Routers/Switches
Problem: Windows NLB IPs are are not reachable through and from Cisco routers and switches. NLB services could be IIS arrays, Exchange CAS arrays, etc. Solution: NLB mode was set to Multicast. In this mode Windows incorrectly uses multicast mac addresses. Set the NLB mode to Unicast and configure static mac address ...