Artifact publishing fails when IIS is used as a reverse proxy

Symptoms

1. TeamCity server is configured behind IIS as a reverse proxy.
2. TeamCity build agent connects to the TeamCity server through the reverse proxy.
3. The build agent can't publish artifacts and gets stuck in an infinite loop. The build log shows: [11:15:05]Publishing artifacts [11:15:05][Publishing artifacts] Collecting files to publish: [toZip/** => artifact.zip] [11:15:06][Publishing artifacts] Creating archive artifact.zip (9s) [11:15:06][Creating archive artifact.zip] Creating C:\BuildAgent\temp\buildTmp\ZipPreprocessor2847146024236637664\artifact.zip [11:15:15][Creating archive artifact.zip] Archive was created, file size 32142324 bytes [11:15:15][Publishing artifacts] Sending toZip/** [11:15:25][Publishing artifacts] Sending toZip/** [11:15:39][Publishing artifacts] Sending toZip/** [11:15:48][Publishing artifacts] Sending toZip/** [11:16:01][Publishing artifacts] Sending toZip/** [11:16:16][Publishing artifacts] Sending toZip/**
4. teamcity-agent.log is filled with 404 responses from IIS: [2012-08-01 12:04:55,514] WARN - jetbrains.buildServer.AGENT - <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/> <title>404 - File or directory not found.</title> <style type="text/css"> <!-- body{margin:0;font-size:.7em;font-family:Verdana, Arial, Helvetica, sans-serif;background:#EEEEEE;} fieldset{padding:0 15px 10px 15px;}

Cause

The most common cause for this is the maxAllowedContentLength setting in IIS either:

• is set to a too small value;
• is left unconfigured and so defaults to 30000000 bytes (<30 Mb).

So any artifact larger than maxAllowedContentLength is discarded by IIS.

Resolution

Increasing the maxAllowedContentLength setting in IIS should resolve the issue.