I have to access certain URLs from Appian Server which is behind our company fir

You can review your application server documentation. Here's an example on how this can be done for JBoss stackoverflow.com/.../how-to-set-a-proxy-for-a-jboss-instance however, keep in mind these settings are not compatible with the Call Web Service node.

Thanks Eduardo for the reply.
I want to access external Webservice(SalesForce WSDL) through webservice node but it not able to connect to the service as the server is sitting behind the firewall. Can we have any way of achieveing this?

Moreover do we have any option of setting proxy settings in anywhere in appian/Jboss so that the URL(Salesforce webService) can be accessed. One way of doing this is doing through smart service plugin but we need to write it again and again for every method in the WSDL.

Any suggestion for the same will be greatly appreicated.

Call Web Service Smart Service cannot be configured to use a proxy, even if the JVM arguments http.proxyHost and http.proxyPort are passed to JBoss.
Refer: This has been reported under the reference number AN-47329.
We tried SendHttp node and also no luck as of now.
I do have a https and external docusign rest api call to make and we are behind firewall and proxy.

Did anyone end up in customizing the existing smart service for this yet?