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Seq Forwarder Build status Join the chat at Download

Seq Forwarder is a client-side tool for sending log data to Seq.

HTTP forwarding

Seq Forwarder can run as a Windows service on client machines. It receives events over a local HTTP API and persists these to its own internal storage until the remote Seq server can be reached.

Seq Forwarder

Seq Forwarder listens on port 15341 by default. The HTTP ingestion API is identical to the Seq one, so standard client libraries like Serilog.Sinks.Seq can write to it directly.

Log.Logger = new LoggerConfiguration()  

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

Importing JSON log files

The seq-forwarder import command can be used to import JSON log files directly into Seq. The log file needs to be in Serilog's native JSON format (e.g. produced by the Seq sink or Serilog's JsonFormatter) with one JSON-encoded event per line.

seq-forwarder import -f myapp.json -u https://my-seq -p User=appuser1 -p

The command will print a GUID ImportId that will be attached to the imported events in Seq. Additional properties can be specified on the command-line, like User= and Email= above, to tag the events.


Visual Studio 2017 is required. The solution is currently a Windows-only .NET 4.5.2 application. .NET Core support is intended sometime after its RTM.

You will need Wix 3.10 to build the setup/MSI.


F5 will work, but you will need to either run the install command (see below) to create an HTTP namespace reservation, or run as Administrator (on Windows).


The outputs from Seq.Forwarder and Seq.Forwarder.Administration (if required) projects can be XCOPY-deployed.


Run Seq.Forwarder.Administration.exe to install the forwarder, or check out the command-line for scripted setup.


By default the "forwarder" logs will be stored under %PROGRAMDATA%\Seq\Logs. If the destination is not available, an exception will be stored in these log files.

If you need to inspect the current configuration, it can be found at: %PROGRAMDATA%\Seq\Forwarder\SeqForwarder.json

Command-line usage

List available commands:

seq-forwarder help

Get command help:

seq-forwarder help <command>

Install as a Windows service:

seq-forwarder install

Set destination Seq server details:

seq-forwarder config -k output.serverUrl --value="http://my-seq/"
seq-forwarder config -k output.apiKey --value="1234567890"

Start the Windows service:

seq-forwarder start

Run interactively:

seq-forwarder run

Change the buffer size cap (defaults to 64 MB):

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


Local collection and reliable forwarding of log data to Seq




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