Windows : How to change the Exchange MailStore database path

By default, Microsoft Exchange Server will place the MailStore database in the installation folder as followed : C:\Program Files\Micros oft\Exchange Server\V15\Mailbox\Mailbox Database 0000000000\Mailbox Database 0000000000.edb It may be suitable for small scale setup, however you may want to change it to a different path for various reasons when come to medium or large scale setup…… Read More »

Linux : How to enable NTP loopfilter statistics on RHEL/CentOS?

You may end up at some point where you need detailed statistics about time synchronization on your Linux machine. To achieve that, simply do the following : 1. Edit your NTP configuration file :

2. Append the following parameters :

3. Restart the NTP daemon :


JunOS : Packet loss (ICMP drop) observed with rapid pings

You probably noticed that rapid pings toward a JunOS device result in a loss of packet as the example shown below. In our case we are issuing the ping from a Cisco router : Sending 100, 500-byte ICMP Echos to, timeout is 2 seconds: Packet sent with a source address of .!!!!!!!!!.!!!!!!!!!.!!!!!!!!!.!!!!!!!!!.!!!!!!!!!.!!!!!!!!!.!!!!!!!!! .!!!!!!!!!.!!!!!!!!!.!!!!!!!!!… Read More »

Windows : NTFS Warning The system failed to flush data to the transaction log. Corruption may occur.

Having repeated NTFS warning entries in EventViewer as the one below? Log Name: System Source: Ntfs Event ID: 57 Task Category: (2) Level: Warning Description: The system failed to flush data to the transaction log. Corruption may occur. This indicate an issue with the filesystem recovery mechanism and the filesystem might not be fault tolerant… Read More »

Linux : SAProuter WARNING: wildcard character used in route target

Have you noticed the following on the console output of SAP Solution Manager? WARNING: wildcard character used in route target This is because you have a wildcard “*” set in the target host <dest-host> and/or the target port <dest-serv>. SAP do not recommend this practice for security reason and output this warning on purpose. However, this… Read More »

Networking : DWDM channels reference chart

Here is a chart for the various DWDM optic channels below. Wavelenght band overview : O-Band : 1270nm to 1370nm E-Band : 1371nm to 1470nm S-Band : 1471nm to 1530nm C-Band : 1531nm to 1570nm L-Band : 1571nm to 1611nm Channel Wavelength (nm) Frequency (THz) 72   (DWDM Channel C72) 1520,25 197,20 71   (DWDM… Read More »

Windows : How to reset the Avast Enterprise Administration Console password

Have you forgotten you Avast Enterprise Administration console password? Fortunately, there is a way to reset it using the “AmsTool.exe” utility, provided with the software. 1. Open the Command Prompt with administrative rights. 2. Enter the following command :

NOTE : If for any reason the command does not complete, you may try to… Read More »