These docs are for v4.2. Click to read the latest docs for v2024.3.

Seq Forwarder

Seq Forwarder collects and forwards logs for machines with unreliable network connectivity


Under Development

Seq Forwarder is a new project that's being developed collaboratively on GitHub. Installers can be downloaded from the Releases page.

Seq Forwarder is an application that collects logs on occasionally-connected machines, and ships these to Seq when network connectivity is available.

Seq Forwarder runs as a Windows Service on the remote machines, and accepts events through HTTP connections on localhost. The API exposed by the forwarder is identical to the Seq one for collecting raw events.

Log.Logger = new LoggerConfiguration()  

Log.Information("Hello, Seq Forwarder!");

Instead of the Seq default port 5341, the forwarder listens on 15341.

The forwarder doesn’t itself require an API key – make sure inbound connections on port 15341 are denied by the application machine’s firewall (on Windows this will be the default).

Events are buffered in a local database until they can be batched up and sent to the remote Seq machine.


The size of the buffer can be capped: by default, up to 64 MB will be used, so that an un-monitored machine doesn’t exhaust its local storage. The forwarder uses a configuration file in C:\ProgramData\Seq\Forwarder and provides a command-line tool for administration:

seq-forwarder config -k storage.bufferSizeBytes -v 1073741824  
seq-forwarder restart