Windows – ‘Sorry, there was a problem mounting the file’ With ISO Files
KB ID 0001122 Problem Seen on Windows 10, and Server 2012, when attempting to open or mount an ISO file, (even downloaded direct from Microsoft). You get the following error; Note: Can also been seen with .VHD files. Couldn’t Mount File Sorry, there was a problem mounting the file. Solution Before you try anything else simply COPY the iso file to the root of your C: drive, and try again. 99% of the time simply copying the file...
Exchange – Certificate Invalid ‘Revocation Check Failed’
KB ID 0001121 Problem When you check the status of a certificate in Exchange and it it displayed at ‘Invalid’ and the details show that the revocation check has failed. Solution This can happen if your certificate CA has its CRL or OCSP information setup incorrectly, or the Exchange sever simply cannot access them to verify the validity of the certificate. If you are using your own CA the correct way to fix the problem is...
Windows Server 2012 – Add Role Error 0x800f0902
KB ID 0001120 Problem I was setting up a print server yesterday, when I tried to add the print server role it failed with this error; Unable to obtain feature list error 0x800f0902 Solution Internet searching was pointing to a problem with the ‘Task Scheduler Service’ and suggested stopping that, which I was unable to do. It turns out my server had just finished Windows updates, and needed to reboot, (it was a new...
Windows Server 2012 R2 – Stop IE Opening ‘In Metro’
KB ID 0001119 Problem I was working on some Server 2012 R2 servers this morning, and every time I tried to launch IE, instead of the normal IE 11, it stubbornly kept opening the the IE App. Solution Hit the Windows key > Type in ‘internet options’ > make the following changes; Programs Tab > Opening Internet Explorer > Select ‘Always in Internet Explorer on the desktop’ > Apply > OK. Related...
Cisco ASA – Active / Active Failover
KB ID 0001114 Usually when I’m asked to setup Active/Active I cringe, not because its difficult, its simply because people assume active/active is better than active/standby. I hear comments like ‘we have paid for both firewalls lets use them’, or ‘I want to sweat both assets’. The only real practical use cases I can think of for Active /Active are; You have a multi-tenancy environment and want to offer...
Cisco IOS – Setting Up DHCP Scopes
KB ID 0001112 I usually only have to do this on very small sites, or occasionally on the test bench. Most of the time we will have a server sat doing DHCP. The procedure below was carried out on a router, but the procedure is the same for a catalyst switch. By default DHCP is disabled, you have to turn it on, then create a ‘dhcp pool.’ Petes-Router(config)#service dhcp Petes-Router(config)#ip dhcp pool DATA-VLAN-10 Then...
HP Networking – Tracing Networks and Locating IP addresses
KB ID 0001110 After not touching one for a couple of years, I was back on HP switches recently, and I had to map out a clients switches. Now I could have used some software, but they didn’t have SNMP enabled so, I had to ‘re acquaint’ myself with LLDP. For a basic LLDP View of attached devices. HP-Switch-1# show lldp info remote-device LLDP Remote Devices Information LocalPort | ChassisId PortId PortDescr SysName...
Exchange – Message Not Sent ‘Because there are too many recipients’
When attempting to send an email to a large amount of recipients, you may see the following error; This message wasn’t delivered to anyone because there are too many recipients, the limit is {number}. This message has {number} recipients To check what the limit is set to launch the Exchange Management Shell, and ecxecute the following command; Get-TranportConfig To raise the limit (in this example to...
GNS3 – Initial Setup, Adding Routers, Hosts, and ASA Firewalls
KB ID 0000927 NOTE: THIS ARTICLE IS FOR THE OLD VERSION OF GNS3 GO HERE FOR THE NEW ONE Problem I dip into GNS3 every so often, (depending on what I’m working on). And each time I install it, I spend just as long remembering how to set it up, as I do using it! So, if for no other reason than I can use this page as a reference in future, here’s how to get it up and running. Solution Note: At time of writing he latest...
Build a PIX Firewall for your test network
Working with GNS3 and PEMU – (Part 2) KB ID 0000662 Problem In Part 1 we installed and Licensed our Virtual PIX, now we will give it an IP address and get the firewalls web management console running. To complete this procedure you will need to, 1. Have a TFTP server up and running (CLICK HERE). 2. Know how to connect to a Cisco Firewall (CLICK HERE). Solution Step 1 (Add an interface to your host machine) 1. On your host PC/VM...