---
id: 36faaf17-6e3d-40c2-a97d-e2543f3de3ba
---

# Apache URL Redirection Loops Detected.
---

This incident type relates to the detection of URL redirection loops in Apache web server instances. A URL redirection loop occurs when a client request is redirected to a URL that eventually redirects the client back to the original URL, resulting in an infinite loop. This can cause performance degradation and impact the availability of the web server. Detection of such loops is important to prevent such issues and ensure proper functioning of the web server.

### Parameters
```shell
export VIRTUAL_HOST_NAME="PLACEHOLDER"

export URL="PLACEHOLDER"

export PATH_TO_APACHE_DIRECTORY="PLACEHOLDER"

export PATH_TO_APACHE_CONFIG_FILE="PLACEHOLDER"
```

## Debug

### Check if Apache is running
```shell
systemctl status apache2
```

### Check Apache error logs
```shell
tail -f /var/log/apache2/error.log
```

### Check Apache access logs
```shell
tail -f /var/log/apache2/access.log
```

### Check Apache configuration for any redirect loops
```shell
apachectl -t -D DUMP_VHOSTS | grep ${VIRTUAL_HOST_NAME}
```

### Check if DNS is resolving correctly
```shell
nslookup ${URL}
```

### Check if the URL is redirecting to the correct location
```shell
curl -I ${URL}
```

### Check the HTTP status code
```shell
curl -s -o /dev/null -w "%{http_code}" ${URL}
```

## Repair

### Implement 301 redirects instead of 302 redirects for permanent URL redirections to prevent loops.
```shell


#!/bin/bash



# Set the variables for the Apache web server root directory and the configuration file

APACHE_DIR=${PATH_TO_APACHE_DIRECTORY}

CONFIG_FILE=${PATH_TO_APACHE_CONFIG_FILE}



# Create a backup of the configuration file before making any changes

cp $CONFIG_FILE $CONFIG_FILE.bak



# Replace all instances of "Redirect 302" with "Redirect 301" in the configuration file

sed -i 's/Redirect 302/Redirect 301/g' $CONFIG_FILE



# Restart the Apache web server to apply the changes

systemctl restart apache2


```

This incident type relates to the detection of URL redirection loops in Apache web server instances. A URL redirection loop occurs when a client request is redirected to a URL that eventually redirects the client back to the original URL, resulting in an infinite loop. This can cause performance degradation and impact the availability of the web server. Detection of such loops is important to prevent such issues and ensure proper functioning of the web server.


This incident type refers to an unauthorized access to directories in Apache HTTPD, which is a widely used web server software. It means that someone was able to access files or directories that they were not supposed to, without having proper authorization. This type of incident can potentially lead to sensitive data being exposed or even stolen, and can compromise the security of the server and the applications running on it.


Unauthorized Directory Access in Apache HTTPD.

The Slowloris Attack is a type of Denial of Service (DoS) attack that exploits a vulnerability in the Apache web server. It works by sending HTTP requests to the server and keeping those connections open for as long as possible, thereby using up all the available resources of the server and rendering it unresponsive to legitimate requests. As a result, the server becomes slow or unresponsive, causing downtime for the affected website or service. This type of attack can be detected and mitigated by implementing specific security measures and tools.


Slowloris Attack Detected on Apache server.

This incident type refers to a problem with the load balancing functionality of the Apache HTTP server when using the mod\_jk connector. This can cause issues with distributing incoming traffic across multiple servers, resulting in reduced performance or even downtime for the affected services. It is important to address and resolve these issues as quickly as possible to minimize impact on users and ensure the stability of the system.


Mod_jk Load Balancing Issues in Apache HTTP.

This incident type refers to a security vulnerability in the SSL/TLS configuration of the Apache HTTP Server, which can leave the server and its users vulnerable to attacks. The SSL/TLS configuration is responsible for encrypting the communication between the server and its clients, and if it is not configured properly, it can be exploited by hackers to intercept or modify sensitive data. This type of incident requires immediate attention from software engineers to ensure that the SSL/TLS configuration is properly configured to prevent any potential security threats.


Inadequate SSL/TLS Configuration for Apache HTTP Server.

This incident type refers to a situation where the number of child processes created by an Apache server reaches a high threshold, causing performance issues and potentially leading to server crashes. This can occur due to factors such as high traffic volume or misconfigured server settings. The incident requires investigation and mitigation to restore normal server functioning and prevent future occurrences.


High Number of Apache Child Processes Incident

```shell
export VIRTUAL_HOST_NAME="PLACEHOLDER"

export URL="PLACEHOLDER"

export PATH_TO_APACHE_DIRECTORY="PLACEHOLDER"

export PATH_TO_APACHE_CONFIG_FILE="PLACEHOLDER"
```


### Check if Apache is running

```shell
systemctl status apache2
```

### Check Apache error logs

```shell
tail -f /var/log/apache2/error.log
```

### Check Apache access logs

```shell
tail -f /var/log/apache2/access.log
```

### Check Apache configuration for any redirect loops

```shell
apachectl -t -D DUMP_VHOSTS | grep ${VIRTUAL_HOST_NAME}
```

### Check if DNS is resolving correctly

```shell
nslookup ${URL}
```

### Check if the URL is redirecting to the correct location

```shell
curl -I ${URL}
```

### Check the HTTP status code

```shell
curl -s -o /dev/null -w "%{http_code}" ${URL}
```


### Implement 301 redirects instead of 302 redirects for permanent URL redirections to prevent loops.

```shell


#!/bin/bash



# Set the variables for the Apache web server root directory and the configuration file

APACHE_DIR=${PATH_TO_APACHE_DIRECTORY}

CONFIG_FILE=${PATH_TO_APACHE_CONFIG_FILE}



# Create a backup of the configuration file before making any changes

cp $CONFIG_FILE $CONFIG_FILE.bak



# Replace all instances of "Redirect 302" with "Redirect 301" in the configuration file

sed -i 's/Redirect 302/Redirect 301/g' $CONFIG_FILE



# Restart the Apache web server to apply the changes

systemctl restart apache2


```


Apache URL Redirection Loops Detected.

Overview

Parameters

Debug

Check if Apache is running

Check Apache error logs

Check Apache access logs

Check Apache configuration for any redirect loops

Check if DNS is resolving correctly

Check if the URL is redirecting to the correct location

Check the HTTP status code

Repair

Implement 301 redirects instead of 302 redirects for permanent URL redirections to prevent loops.

Learn more

Related Runbooks

Unauthorized Directory Access in Apache HTTPD.

Slowloris Attack Detected on Apache server.

Mod_jk Load Balancing Issues in Apache HTTP.

Inadequate SSL/TLS Configuration for Apache HTTP Server.

Support