Articles tagged with troubleshooting

1. Understanding the “Semaphore Released Too Many Times” gsutil Error

   Posted on August 29, 2024 in System Administration

   When working with Google Cloud Storage (GCS) via gsutil, most file operations run smoothly. However, occasional cryptic error messages may appear that leave you scratching your head. One such error is:

   Semaphore released too many times MiB]  99% Done
   CommandException: 1 files/objects could not be copied/removed.
   make: *** [Makefile …

2. Cisco load-interval 30: When to Use It and When to Leave It Alone

   Posted on February 25, 2024 in Networking

   Cisco load-interval 30 makes show interface traffic rates more responsive during troubleshooting, but it also makes short bursts more visible and can confuse alerting if you treat it like a long-term trend.

3. Unable to Connect to Remote Asterisk: Fixing the asterisk.ctl Error

   Posted on February 16, 2024 in Voice / Telephony

   Fix the Asterisk CLI error about /var/run/asterisk/asterisk.ctl by checking whether Asterisk is running, where astrundir points, and whether the CLI user can access the control socket.

4. Troubleshooting "%TAC+: no address for get_server" on Cisco Devices

   Posted on February 10, 2024 in Networking

   If a Cisco router or switch logs %TAC+: no address for get_server, start with the boring explanation: the device has a TACACS+ server entry it cannot turn into a usable destination address.

   That usually means one of four things:

   1. The TACACS+ server is configured with a bad hostname or missing …

5. Testing Network Performance with iPerf, Tclsh, TTCP, and IP SLA on Cisco

   Posted on October 11, 2023 in Networking

   If you search for "tclsh iperf Cisco," you are usually trying to answer a very reasonable operational question: can I generate useful test traffic from the Cisco device itself instead of dragging a laptop to the far end of the network?

   The answer is yes, sometimes. The catch is that …

6. Configure Simultaneous VPN Logins on Cisco ASA Without Weakening Access Control

   Posted on August 24, 2009 in Networking

   Cisco ASA limits the number of concurrent remote-access VPN sessions a user can maintain. The default is three. When a user hits the limit, a new connection can fail or an existing idle session can be removed, depending on the configured limit and session state.

   The CLI knob is still …

7. How to Check Power Supply Status on Cisco Switches and Routers

   Posted on July 25, 2007 in Networking

   When a Cisco switch or router reports a power problem, start by finding out whether the issue is input power, a failed supply, redundancy, PoE budget, or a sensor alarm. Those are related, but they are not the same failure.

   For most Cisco IOS and IOS XE platforms, this is …