Error 413 occurs when InterScan Web Security Virtual Appliance (IWSVA) is used as a reverse proxy

Interscan Web Security Virtual Appliance 6.0 , Interscan Web Security Virtual Appliance 6.5

Last updated: 2025/05/08

Solution ID: KA-0006151

Category: Configure

Error 413 is produced by Nginx when IWSVA is used as a reverse proxy.

The error occurs because IWSVA does not change the default Nginx value of 1 MB upload size.

To fix this issue use the following workaround.

Access IWSVA as root via SSH
Create a copy of /var/iwss/reverse_proxy/conf/main.conf file:

# cp /var/iwss/reverse_proxy/conf/main.conf /var/iwss/reverse_proxy/conf/main.conf.COPY
Use vi or vim to open and edit the /var/iwss/reverse_proxy/conf/main.conf file:

# vim /var/iwss/reverse_proxy/conf/main.conf
Add/edit the "client_max_body_size" after the "http {" line.

For example:
client_max_body_size 20M;
Save the change and restart all IWSVA services by running this command:

# /usr/iwss/rcIwss restart

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