Last winter, the owner of an auto-parts mold company in Shunyi came to me. He said his team of about twenty people was using a hand-assembled PC as a file server. It blue-screened every few days, and mold drawings were constantly deleted by accident. The machine had been running for nearly six years, nobody knew the password, and it held over a hundred GB of historical data. The first question he asked me was: is moving to the cloud the least troublesome option? He is not the only one asking this. Over the years I have worked with…

Why choosing the wrong DNS can take an entire office offline during afternoon tea. Last year we handled an incident for an auto-parts export company in Shunyi. When the engineer arrived on site, more than twenty computers in the office could not open the client’s quotation system. After checking around, it turned out the network was not down — DNS resolution was timing out. They were using broadband set up by their landlord, and the DNS server was 202.106.0.20 from a local carrier, and responses…

Authentication: from static credentials to continuous trust evaluation. Traditional VPNs rely on usernames and passwords plus static certificates, and once authentication passes, the user gets full network permissions. That “verify once, allow forever” model already looks quite dangerous in 2024. I have seen more than one company’s VPN taken down by credential-stuffing attacks, with the attacker following the tunnel straight into the internal finance system. They do not even need privilege escalation, they just…

Start by understanding the operating conditions: the essential difference between online and standby UPS. Last winter I visited a client’s server room for an inspection and found they had equipped their core database server with a standby UPS. The boss said confidently, “As long as there’s a UPS, it’s fine.” I asked whether he knew how long a standby UPS takes to switch over, and he said, “A few milliseconds, it doesn’t matter.” In fact, a few milliseconds matters a great deal for an x86 server running an ERP database…

A practical guide for Beijing companies applying for enterprise broadband or dedicated lines: first clarify the differences between dedicated lines and broadband, compare the four major carriers (China Telecom, China Unicom, China Mobile, and China Broadcasting Network), and get a 7-step standard application process, 7 common pitfalls, budget tables for businesses of different sizes, plus 5 FAQs.

Beijing IT operations companies fall into 4 categories: individuals/studios, specialized outsourcing firms, resellers of major vendors, and all-in-one IT subscription services. This article compares pricing, SLAs, and suitable company sizes for each, and offers a selection decision tree plus 5 signals that it is time to switch providers. Based on Siwenlide’s 14 years of experience serving 300+ Beijing enterprises.

Introduction: Why SMBs Need Professional Firewall Configuration Even More As digital transformation accelerates, cybersecurity is no longer a topic reserved for large enterprises. SMBs face increasingly complex cyber threats as well—ransomware, DDoS attacks, and data breaches keep emerging. Yet many SMBs, constrained by limited budgets, often overlook professional firewall configuration and run on default rules alone, which is tantamount to swimming naked in the vast ocean of the internet. MikroTik RouterOS, a highly cost-effective routing operating system, has become an

Introduction: Why SMEs Need to Master Firewall Configuration In today’s digital era, network security has become part of the infrastructure of business operations. For small and medium-sized enterprises, building a secure and reliable IT environment within a limited budget is a real problem they must face. As the first line of defense for an enterprise network, a firewall’s configuration directly determines the level of security of the company’s data assets. Mikrotik is a globally recognized network equipment vendor, and its

Stuttering office video conferences? It may be a network-layer issue. A single 1080p meeting on Zoom or Tencent Meeting needs 2–3 Mbps, yet many meeting rooms have bandwidth to spare while the video still looks like a blurry mess. The problem usually isn’t whether there’s enough bandwidth, but whether the network is stable and properly scheduled. I’ve run into plenty of these cases on projects, and the troubleshooting approach follows a clear pattern….

Let’s start with a real case: a 200-square-meter office of an advertising agency deployed six APs. The meeting room showed full signal bars, yet browsing was painfully slow — the most typical beginner’s setup I have ever seen. The client assumed more APs meant better coverage, but the 2.4 GHz and 5 GHz channels all overlapped, and every AP was competing with its neighbors for airtime. Put simply, when deployment density and channel planning are done poorly, spending more money only makes things worse. I…