NETWORK – Domain Web Center

Cisco VPN Client Error 51 – Open Your Firewall

2026-06-02 Udar Gromov 4

Annoying! How Annoying! This very simple, very typical error message, but it is so hard to find a quick solution. Symptoms: You are starting a Cisco VPN Client and immediately you are getting this error message: Error 51: Unable to communicate with the VPN subsystem. Please make sure that you […]

Windows Photo Viewer: Can’t Rotate Images on a Network Drive – Solved!

2026-03-30 Udar Gromov 1

It is the the LITTLE problems that annoys the most! I love Windows, but why Windows is so awkward in same strange and unexpected ways? This article is about one of such problems – Image viewing and rotation. Why it is so hard? Do not even think to joke here. There […]

Mapping remote WebDAV network drive for free (without NetDrive)

2026-03-23 Hi-Grage 4

If you have a powerful NAS server with massive redundancy (RAID), you wish you can access all files and directories from anywhere on the planet. Recently I switched from Synchronizing Offline file to a real-time access my drive remotely using WebDAV. This twist is that I am using Synology WebDAV […]

Synology DiskStation DS1515+ in action – raw power!

2026-03-22 Udar Gromov 0

[ . . . always in progress . . . ] Everybody who uses little-known in US, but powerful Synology network storage boxes can’t help but fall in love with them. I was thinking to replace my old 2008 Windows server with a new one, but pain of maintaining and configuring stopped […]

Cannot open database … requested by the login. The login failed.

2026-02-09 Udar Gromov 2

Cannot open database “Your_DB” requested by the login. The login failed.
Login failed for user ‘NT AUTHORITYNETWORK SERVICE’.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Data.SqlClient.SqlException: Cannot open database “Your_DB” requested by the login. The login failed.
Login failed for user ‘NT AUTHORITYNETWORK SERVICE’.

[…]

Block PC Outbound Connections on Router Level (All but RDP)

2025-11-17 Udar Gromov 1

This article applies to a scenario, when you already can establish RDP to a machine on your internal network from a remote network. Now you’ve decided to tighten security screws and close all external access to and from that machine except for RDP on the router level. Inbound connections to […]