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# Configuring Inbound Communication
Configuring inbound communication means setting up the connection between a remote sender system and the integration platform. Inbound communication refers to message processing from a remote system, often located in the customer landscape, to Cloud Integration. Here, the integration platform is the server.
## Sender Systems You Can Connect to the Integration Platform
You can connect different kinds of sender systems to the integration platform, for example:
- A cloud application, for example, SAP SuccessFactors
- An on-premise application, for example, SAP ERP
> ### Note:
> If an SAP system based on Application Server ABAP sends requests to Cloud Integration and there are 2 or more worker nodes enabled on Cloud Integration side, you can receive an `HTTP/1.1 403` authentication error. The root cause is that the SAP kernel encodes the cookies' value by default, which breaks the load-balancing feature. To solve the issue, set profile parameter `ict/disable_cookie_urlencoding` to `1` or `2` depending on kernel level. For more information, see SAP note [2681175](https://me.sap.com/notes/2681175).
- A SOAP client
- An e-mail server
- An SFTP server
In this case, the integration platform reads files from the SFTP server \(polling\).
To enable communication with such a variety of systems, Cloud Integration supports the following kinds of connections:
- HTTP connections that allow
- Sender systems to call integration flow endpoints \(through one of the adapters based on the HTTP protocol like, for example, the HTTPS adapter or the SOAP adapter\)
- API clients to call the OData API
- SFTP \(SSH File Transfer Protocol\) connections
- Connections to an FTP server using the Secure File Transfer Protocol \(FTPS\)
- Connections to an e-mail server using the mail sender adapter
- Connections to a Java Message System \(JMS\) message broker
- Connections to an external message broker using the Advanced Message Queuing Protocol \(AMQP\)
**Related Information**
[Configuring Inbound HTTP Connections](configuring-inbound-http-connections-f568400.md "")
[Setting Up Inbound Mail Connections](setting-up-inbound-mail-connections-6ad4956.md "Using the mail sender adapter, you connect the tenant with an e-mail server so that the tenant can read data from the e-mail server (in a process referred to as polling).")
[Tutorial: Set Up Inbound OAuth Client Credentials Grant Authentication for API Clients with SAP-Generated Certificate](https://developers.sap.com/tutorials/btp-integration-suite-oauth-client-certificate.html)
[Tutorial: Set Up Inbound OAuth Client Credentials Grant Authentication for Senders Calling Integration Flows with SAP-Generated Certificate](https://developers-qa-blue.wcms-nonprod.c.eu-de-2.cloud.sap/tutorials/btp-integration-suite-oauth-integration-flow.html)
