Stand: 21.11.2025 08:38:58
Incidents
2025-08-11 20:00Performance Issues Firewall Stufe-2 and Extranet
| Description | Performance issues have been observed since the firewall software upgrade on August 11, 2025.
Individual connections require too many resources, which disadvantages other users.
These users experience higher latencies, which can lead to slow websites, file transfers, etc.
As a first step, the software update suggested by the manufacturer was installed on September 16. This has not yet led to any actual improvement. Troubleshooting together with the manufacturer is ongoing. |
|---|
| Affected users | Users of Firewall Stufe 2 (Area D) und Extranet (Area B) |
|---|
| Exists since | 2025-08-11 20:00 |
|---|
Stand: 21.11.2025 08:38:59
Announcements
2025-01-07 11:14Note: Misbehavior between Windows 11 Update 22H2 in conjunction with specific network switch type
UPDATE, 07.01.25
In 2024, some components could be replaced, but there are still components in use where the malfunction could occur.
_ _ _
A misbehavior has been detected between a network switch type used at KIT South Campus and a Windows 11 update (version 22H2). Due to this misbehavior, the network port on the switch is automatically switched off.
As a result, the network connection or network access for the connected device is no longer available.
To enable network access, the data socket used must be communicated to the IT representative / IT admin of the OU so that he can apply for enabling via the SCC network team.
WORKAROUND
To prevent the network port from being switched off, the LLDP service can be disabled under Windows. This can be done manually (computer-specific) under "Network adapter properties". Furthermore, the SCC provides the group policy "SCC-FMC-LLDP_disable", which can be linked to the computer accounts and automatically disables LLDP under Windows. Unlocking of already blocked ports can be requested from the network team via the IT representative/IT admin of the OU.
AFFECTED
Windows 11 Nutzer mit Updatestand 22H2 (und voraussichtlich höher) in Verbindung mit spezifischem Netzwerk-Switchtyp
TECHNICAL DETAILS
As of Windows 11 update level 22H2, sending Link Layer Discovery Protocol (LLDP for short) packets on a specific type of switching causes a network loop detection service to trigger on the switch, automatically blocking the network port.
(translated with DeepL.com)
Störungen