Step 1: I have used SAP Business one login API and get the sessionId and these session id is used for authentication in another API.
Step 2: I have tested order API using sessionId and it is working fine in postman.
Step 3:
Now I am testing same api with Salesforce anonymous window:

I executed below code using Salesforce anonymous window but it is not working and throwing Read timeout error.

String url = 'http://3.64.141.168:50001/b1s/v1/Orders?$filter=DocEntry lt 8 and((DocEntry lt 8 or DocEntry gt 116)and startswith(CardCode,\'C20000\'))';
String B1SESSION = 'B1SESSION=0e9f02f8-d8d2-11eb-8000-0a0e85552c48';
Http http = new Http();
HttpRequest req = new HttpRequest();
req.setMethod('GET');
req.setHeader('Cookie', B1SESSION);
req.setHeader('Content-Type', 'application/json');
req.setHeader('Accept', '*/*'); 
req.setEndpoint(url);
//Request Send
HTTPResponse res = http.send(req);
Integer responseCode = res.getStatusCode();
System.debug('response Code::'+responseCode);
System.debug('response Body::'+res.getBody());

When I removed query parameter from URL then after it is working fine so I am not getting why it is not working with $filter query parameter?

So it is salesforce bug or salesforce is not supporting complex query parameter like below?

Odata Query Parameter:

$filter=DocEntry lt 8 and((DocEntry lt 8 or DocEntry gt 116)and startswith(CardCode,'C20000'))';