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BugZero found this defect 1643 days ago.
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WatchGuard Technologies | kA10H000000g4bRSAQ
Reverse Proxy fails with blank page displayed for some applications
Last update date:
1/21/2022
Affected products:
Firebox M200
Firebox M300
Firebox M270
Firebox M370
Firebox M470
Firebox M570
Firebox M670
Firebox M290
Firebox M390
Firebox M400
Firebox M500
Firebox M440
Affected releases:
All
Fireware
12.x
12.5.x
Fixed releases:
v12.7.2
Description:
Issue
With some applications, the reverse proxy fails to display a page for users, or users see the error message: net::ERR_CONTENT_LENGTH_MISMATCHThis occurs because of a buffer overflow error with the reverse proxy. To confirm that you are experiencing a buffer overflow error: Set the Diagnostic Log Level for Security Subscriptions > Access Portal to Debug. For instructions, see Set the Diagnostic Log Level. In Firebox System Manager or Web UI, open Traffic Monitor. For instructions, see Traffic Monitor. If your network environment is large or extremely busy, the content of Traffic Monitor might scroll too quickly to identify this log message. In this case, you can use a log tool such as WatchGuard Cloud. To learn more, see About Firebox Logging and NotificationTry to get access to an application that fails with reverse proxy. Review the log messages that appear on the Traffic Monitor > Diagnostic tab. If this is the issue, you see a log message that looks like this: 2019-11-15 13:52:10 wrapper nginx: 2019/11/15 13:52:10 [crit] 6164#0: *140605 pwritev() "/var/run/nginx/nginx_proxy/0000002612" has written only 12288 of 32768 while reading upstream, client: 207.236.65.241, server: example.example.net Debug
Workaround/Solution
Run this CLI command to disable buffering: no access-portal url-mappings proxy-buffering enable
