Filecatalyst — Blocked

When FileCatalyst is blocked, follow this triage sequence:

Add the following paths to antivirus exclusions:

| Layer | Typical Blocking Mechanism | Specific Examples | |-------|----------------------------|--------------------| | | Stateful packet inspection, port blocking | UDP ports 33000–33009 (default) closed; SPI drops non-ICMP responses | | NAT Device | Port exhaustion or mapping failures | Symmetric NAT fails to maintain UDP hole-punching | | Proxy Server | Unsupported CONNECT methods or UDP proxying | HTTP/S proxies intercepting raw UDP traffic | | Endpoint Security | Application whitelisting, DLP rules | Antivirus heuristic blocks FileCatalyst’s kernel driver; DLP blocks file types | | QoS / Traffic Shaping | Rate limiting or drop of UDP bulk traffic | Router polices UDP flows >5 Mbps as “non-essential” | | IDS/IPS | Signature-based drop | False positive match on proprietary UDP pattern | filecatalyst blocked

FileCatalyst is a high-speed file transfer protocol (UDP-based) optimized for transferring large data sets over high-latency or lossy networks (e.g., satellite links, intercontinental WANs). However, organizations frequently encounter scenarios where FileCatalyst traffic becomes , resulting in failed transfers, degraded throughput, or connection timeouts. This paper identifies the root causes of blocking events and prescribes actionable remediation steps.

This document is suitable for an internal technical report, a knowledge base article for IT teams, or a troubleshooting guide for system administrators. When FileCatalyst is blocked, follow this triage sequence:

The clock was ticking down to the final broadcast of "Neon Horizon," the most anticipated digital art event of the decade, and Elias Thorne’s masterpiece was stuck. Elias stood in his dimly lit studio, the blue glow of his monitors reflecting off his glasses. He had spent three years crafting a four-terabyte file that used real-time light data to render a virtual city. It was supposed to be the centerpiece of the global livestream, but the progress bar on his screen had turned a mocking, stagnant red. "FileCatalyst Blocked," the error message read. His heart hammered. FileCatalyst was supposed to be the Ferrari of file transfers—a proprietary UDP-based protocol designed to ignore latency and blast through bottlenecks. But something in the digital pipes had slammed shut. He pulled up the server logs, his fingers flying across the keys. Port Conflict: He checked to see if a rogue application had hijacked Port 21 , the traditional gateway for control signals. Nothing. Firewall Wall: He looked for a "silent" firewall—the kind that IT departments sometimes re-enable during security sweeps, blocking the crucial UDP data range (8000-8999). Everything seemed open. "Ten minutes to air," a voice crackled through his headset. It was Sarah, the production lead in London. "Elias, where’s the city? We’ve got nothing but a test pattern." "It's blocked, Sarah! Something is strangling the UDP stream!" He realized he might be dealing with a CORS issue —a security mismatch where the browser refuses to talk to the Transfer Agent. He dove into his settings, frantically

Are you seeing a specific (like "UDP transmission blocked") or is the application failing to launch entirely? Frequently Asked Questions and Troubleshooting This document is suitable for an internal technical

| Test | Command / Action | Expected Result | |------|------------------|------------------| | Connectivity | fcclient --test <server> -p 33001 | SUCCESS: UDP reachable | | Throughput | fcclient --send testfile.dat --rate 100M | Sustained >90% of line rate | | Log check | grep "blocked" /var/log/filecatalyst/* | No entries |

FileCatalyst (now part of IBM Aspera) provides a connectivity validation tool: fc-diag . Run fc-diag --target <ip> --port 33001 to receive a structured block diagnosis report.