Frequent Error Code 279 [id:17] (Port Unreachable)

[unsigned_var]

While attempt to join games and/or switching servers, I frequently encounter the following error:

Failed to connect to the game. (ID = 17; Connection attempt failed.) Error Code: 279

Upon further investigation using Wireshark, I discovered that the Roblox client is attempting to establish UDP connections to relay servers in the 128.116.50.x range, located in Singapore. However, many of these attempts result in ICMP Type 3 Code 3 responses:

Destination unreachable (Port unreachable)

This seems to indicate that the destination server is not accepting UDP traffic on the assigned port, which results in the client failing to establish a connection and triggering the error (as far as I know)

Please verify if Roblox servers in the 128.116.50.x IP range are misconfigured or are incorrectly rejecting expected UDP traffic.

I also opened all ports in the range 49152 - 65535, but that didn’t do much.

Additional Details

• Location: Philippines
• ISP: PLDT
• Network Conditions: UDP is otherwise functional, with UPnP enabled on the router
• Traceroute & ping: Full path and response from 128.116.50.x is confirmed
• Roblox Player Version: 0.678.0.6780751
• Environment: macOS, Wireshark
• Reproducibility: Frequent

System

• OS: macOS 15.4.1 24E263 arm64
• CPU: Apple M4 Max
• GPU: Apple M4 Max
• Memory: 48 GB

Here’s also the dump from Wireshark:
roblox_unreachable_port.txt (2.6 MB)

Please let me know if there’s any other information I can provide.

EDIT: Although I’m not sure if it’s related, this issue has been happening since around the time “Grow a Garden” started getting bigger. I heard that roblox had to upgrade their infrastructure to support the numbers, so maybe something is being done now that my ISP doesn’t like?

[PlumJar]

Hi @unsigned_var ,

Thank you for your report. Do you have any of your Client logs that you could DM to me? Do any contain “no response”?

Thank you,
PlumJar

[unsigned_var]

Surprisingly enough, I can’t seem to replicate the issue anymore. Logs for version 0.678.0.x has been automatically removed as well. I’ll tag you in this thread and send a message with the client log if I can replicate the issue.

[unsigned_var]

Hello again,

I managed to replicate the issue by accident when entering a game. I’ll send you the log file in PMs.