CloudFlare can only proxy traffic going over the following ports listed below. If your traffic is on a different port, you should create a subdomain for that record and then add it as a record in your CloudFlare DNS zone file as something we don't proxy (gray cloud = no CloudFlare proxy or caching on a record).
For requests made via HTTP:
80
8080
8880
2052
2082
2086
2095
For requests made via HTTPS:
443
2053
2083
2087
2096
8443