Forum Discussion

Agathe_309970's avatar
Agathe_309970
Icon for Altocumulus rankAltocumulus
Aug 29, 2018

HTTP 413 error

Hi everyone,   I have a specific problem and I want to know if you already see that and if you have a solution.   I need to do HTTP POST on a reverse proxy. But I have sometimes the following r...
application delivery
BIG-IP
LTM
boneyard's avatar
boneyard
Icon for MVP rankMVP

if you are already in contact with F5 support let them come up with the root cause, they are best suited to investigate things like this.

if they don't want to and have a valid reason, you seem quite close with a root cause then capture the traffic and look for the differences.

Marvin's avatar
Marvin
Icon for Cirrocumulus rankCirrocumulus
Aug 18, 2022

ok guys I have the anwser, on apache server there exist SSLRenegBufferSize parameter https://httpd.apache.org/docs/current/mod/mod_ssl.html#sslrenegbuffersize 

When you have F5 configured as SSL bridging by default it renegotiates SSL in serverssl profile, which could cause the error in apache ssl.log AH02018: request body exceeds maximum size (131072) for SSL buffer.

There are 3 possible fixes for it:
1. Turn off renegotiation in server SSL profile.
2. Change SSLRenegBufferSize to higher on Apache server
3. Change Renegotiate size in serverssl profile the same as Apache

What I tried was increasing the SSLRenegBufferSize parameter in Apache, but there are several solutions provided by F5 support.

  • boneyard's avatar
    boneyard
    Icon for MVP rankMVP
    Aug 18, 2022

    thank you very much for replying with the answer.