The installation for OpenSSH server in Windows is quite straightforward, as all we need to do is to follow the instructions here. However, it took a while for me to figure out how to change the listening port. Especially, in the installation folder, there is a sshd_config_default file. Changing this does not make any difference. […]
TIL how to disable the timeout of mapped drives in Windows
I was trying to copy some big files over the network to another server, and I mapped the destination drives in the local server for easy copying. However I kept getting errors in my script, which I suspected because the drives getting disconnected. Here is how to set it to not disconnect. Run as administrator […]
TIL how to check the bandwidth between 2 servers
We subscribed for a dedicated line between 2 datacenters, and when we were trying to copy some files over, it was really slow. We were supposed to get few MB/s transfer rate, but were getting only 20KB/s which was unacceptable. We needed to make a clear case with the service provider to get their support […]
How I recovered an unbootable Linux server hosted in OVH/SoYouStart
My friend has a server hosted in SoYouStart, and suddenly the server went down and nobody knew why. He asked my helped to bring it back online. We tried to boot into recovery mode from the console, and we were able to login using the credentials sent by them. We were also able to download […]
How to fix the error “an authentication error has occurred(code 0x80004005)” when connecting through RDP.
Ever since the policy to disable TLS 1.0 was pushed down to the local machines, we started getting the error “an authentication error has occurred(code 0x80004005)” when accessing few of our Windows 2008 R2 servers. It was interesting because we have a bunch of other servers with no problems accessing. This seems to be a […]
Fix “Failed to open Group Policy Object. You might not have the appropriate rights” error
I was facing this error in one of my servers while trying to open gpedit, with additional message “The volume for a file has been externally altered so that the opened file is no longer valid”. Here is how I fixed it. 1) Enable view hidden files from explorer. 2) Navigate to C:\Windows\System32\GroupPolicy\Machine 3)Rename the […]
Fix problems in trusting files from a DFS namespace
So we migrated our fileshare to a DFS namespace and we started facing a lot of problems. One of the most annoying one was, no matter how we trust the source, the powershell scripts from the DFS namspaces were not able to run, as they give warning. Interestingly, problem was that the FQDN of the […]
How to export services and their users into csv
I need to export the services and their ‘run as’ users in a number of servers. This is how I did it. #Ebin Issac 6/3/2018 #This will read a list of servers from a text file, and extract the services which are not run by localsystem, and save into a csv file. Need to be […]
How to export group memberships of Active Directory users into CSV format..
So I started a new job recently, and I am working on a as-is migration. I needed to export the list of AD users and their group memberships into human readable format. So this is how I did it. $users = Get-ADUser -Filter * foreach ($user in $users) { $Groups = (Get-ADPrincipalGroupMembership -Identity $user.SamAccountName | […]
How to fix puppet certificate errors
When we recently took over some client’s infrastructure, we started to get the following error. I just had to renew the cert to fix this. To renew, follow the steps below: 1.Delete the old certificate from client. root@agent1:/etc/puppetlabs/puppet# mv ssl ssl.20171115 2.Delete the old certificate from server. root@ip-172-31-7-177:/home/ubuntu# puppet cert clean agent1.ap-southeast-1.compute.internal //make sure to change the […]