Connecting to Firebird 3 - database-connection

I have installed Firebird 3.0.1 on a PC and on a VM client. I installed Flamerobin on both to test the connection.
I can connect to localhost on both PC and VM using Flamerobin, so I assume the Firebird server is running on both and Flamerobin is installed on both OK
I can connect to the Firebird server on the VM from the PC and open a database Ok
From the VM I can open a database on the PC, but when I try to retrieve the server version on the PC I get an error ISC_Service_attach failed (Unable to complete network request to host).
I have no idea what the problem is given that I can open a database ok, but cannot access any of the utility services.
I am using fbclient.dll 3.0.1.32591 on both VM and PC

If you can achieve network request to server, you need to check firewall setings on server and set fb default port as inbound acceptable. If you would had same problem after that, than you probably need proper fbclient library, for FB3 on client, VM. Hope this helps.

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Azure Hybrid Connections to onsite SQL Server with a Linux PHP WebApp - sanity check

Okay, I feel I'm pretty good at problem solving but I'm stumped! I can't get connectivity to the SQL Server via the Hybrid Connector or directly.
System Overview:
1x Linux PHP Based WebApp with all the correct SQLSRV libraries working (using a azure sql server I can get the webapp working fine, but need to use our onsite server for the time being)
1x Onsite SQL Server (win2012, sql version 11.0.7), which has an external static IP (and FQDN) and exposed to the internet on port 1433 (I can use SMSS from an external IP to connect and manage the server - with that IP added to the firewall that is..)
So firstly - trying to connect via PHP / SQLSRV directly to the server doesn't work (even if I allow all internet traffic to connect to the server via the firewall) - which is odd as SMSS works. The server is Win2012 and TLS 1.2 is enabled - but I get Error code 0x2746. Investigating this, I think its something to do with openssl 1.1.1 and SQL Server still only using SHA1 - I modified the openssl.cnf file to SECLEVEL=1 - still not dice.
So I've proceeded to setup the Hybrid connections using port 1433 using internal machine name say 'SERVER01' for the endpoint - everything says connected on both the azure hybrid screen and also on the connection manager on the server. I can telnet from SERVER01 to the service endpoint bus and from SSH on the WebApp I can ping the hybrid end point 'SERVER01:443'
But trying to connect to the database from PHP using SQLSRV it timeouts.
Anyone got any pointers? I'm thinking its due to the old onsite server being too old (Win2012) and the SSL SHA1 issues.

Connection Error in Guacamole: The remote desktop server is currently unavailable. If the problem persists, please notify your system administrator

I am trying to setup up guacamole in a Digital Ocean Droplet (Ubuntu 18.04). I followed the steps provided in https://computingforgeeks.com/install-and-use-guacamole-on-ubuntu/ to setup guacamole and used Postgresql to authenticate guacamole by following the instructions provided in https://guacamole.apache.org/doc/gug/jdbc-auth.html#idm46227496294336.
The installation got over and I am able to access the webpage at http://droplet-ip:8080/guacamole, but when I try to connect to a remote machine over RDP I get a connection error stating 'The remote desktop server is currently unavailable. If the problem persists, please notify your system administrator, or check your system logs.'
I have checked the login credentials of the remote device, it's hostip and RDP port number, everything is correct. I am able to login to the machine through Remote Desktop Connection in Windows. I can also login to the same remote machine with same credentials in a perfectly working guacamole setup in another digitalocean droplet.
I have also tried this by installing guacamole using docker by following instructions provided in https://wiki.networksecuritytoolkit.org/index.php/HowTo_Setup_Guacamole, but still face the same problem. What am I doing wrong? I would be happy if someone could help me solve this problem
I was finally able to figure out why I was not able to connect to a remote device in Guacamole.
My Digital Ocean Linux droplets had freeRDP already installed. But Guacamole Server 1.3.0 works on freeRDP2. I had to make Guacamole send requests through freeRDP2.
I have enabled SFTP in the connection settings. But somehow the OpenSSH was corrupted in the remote machine resulting in connection error. So, I disabled SFTP. I think guacamole tries to establish RDP and SFTP connection in the very beginning, so even if one of the protocols fail, connection cannot be established. I am not proficient with guacamole so not sure with this point.
After resolving these problems, guacamole was able to send connection request to the remote machine. I checked the status using netstat and the status was SYN_SENT, but there was no response from the remote server. The problem was Firewall.
I allowed the ports for RDP in windows firewall, but the remote machine was in a network which had external firewall. I added the Guacamole Server IP in allowed list for NAT forwarding in the firewall device and finally I was able to establish a connection with the remote machine.

Firebird database connection by FireDAC after Windows 10 update

I have some delphi applications with connection to Firebird database by FireDAC technology. It works fine, but after Windows 10 update 1803, cannot connect to database when I call application stored in network path (example: \comp1\share\myapp.exe or Q:\myapp.exe, Q: is mapped server path). Error status is 335544721 with illegal parameter.
The same build of application stored on local path works fine. Can anybody help Me?
I've got the same problem!! The reason is the Firebird version 1.5.x (maybe 2.5 too?). Windows Update 1803 blocks the communication between client and server. The only solution is to migrate to Firebird 3.0.x (or to uninstall the update - not a really good option).
I had the same problem with my delphi application I developed a couple years ago, after an update to windows 10 in one of my machines it suddenly drops the connection to the firebird server (2.50 in superserver mode) installed on a windows 7 host, while my other hosts (win xp, win 2003, win 7 and 8.1) connects normally, when I ping or telnet to the server adresse from win10 (telnet 192.168.1.X 3050) the connection establishes, I have tried everything like enabling Smbv1 and disabling v2 and v3, run it under a VM (win 7) machine inside win10 I was surprised to not being able to connect too, then I realised that it wasn't a network hardware configuration problem, but for unexplained reasons WINDOWS DEFENDER, I just disabled it and then my app was able to connect.
And don't rely on firebird's returned error messages they don't discribe the real issue, and can mislead you.
I forgot to mention that I did enabled some services before disabling win defender, wich were disabled after windows update 1803:
Set both Function Discovery Services to Automatic and Start Them
SSDP Discovery set to automatic.
UPnP Device Host set to automatic.

How to create a telnet connection in Delphi applications

I want to create a telnet connection in Delphi that will allow me to connect to the command prompt on my computer.
If you want a telnet server, Windows XP and newer comes with a telnet service that just needs to be enable and started via the service control manager. It is disabled by default when windows is installed. I recommend against writing your own telnet server unless you really know what you are doing because you are likely to create a lot of security issues.

Visual Studio 2010 and discovery of advantage server error

I installed VS 2010 on a Windows 7 64 bit machine. When I try and connect to an advantage database through the server explorer using the Advanatage OLEDB driver I get a cannot discover advantage database server error. I can connect to the database using the ARC just fine. I was able to connect in VS 2008 just fine. Any ideas on why I can't connect in VS 2010?
If you are trying to connect with "local server", then be sure that your connection string contains "ServerType=ADS_LOCAL_SERVER;". If using Advantage Database Server (remote server), then this link might have some ideas that help. It discusses various ways to provide the IP address and port number if discovery is failing. For example, you can include the port number in the connection path: \\servername:6262\path\dictionary.add.

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