whatportis.com
suggest an edit →

Port 1755Microsoft Media Services

Microsoft Media Services (MMS) is a protocol suite created by Microsoft to stream multimedia content, such as audio and video, typically deployed in enterprise environments and through media applications like Windows Media Player. MMS facilitates real-time delivery, enabling users to experience smooth playback over a variety of network types without having to download entire media files beforehand..

inStreamingMedia
transport
tcp · udp

2 transports registered

in transit
cleartext

payload readable on path

assignment
official

registered with iana

risk
4/10

caution

lookups
13,826

rank 256 of 993 · top 26%

Technical Details

what runs on :1755

Microsoft Media Services (MMS) is a proprietary protocol designed by Microsoft to support the delivery of multimedia streaming content, including both audio and video. It acts as an umbrella term encompassing multiple protocols, such as Microsoft’s implementation of RTP (Real-time Transport Protocol) over UDP or TCP, and an early primitive proprietary messaging protocol before the prominence of HTTP streaming. MMS enables clients to begin playback while media is still being transferred, optimizing bandwidth usage and reducing latency for live and on-demand content.

Originally, MMS operated over port 1755 using either UDP for real-time datagram communication or TCP for reliable delivery, depending on network conditions and firewall traversal. Later, Microsoft encouraged transitioning to RTSP (Real Time Streaming Protocol, usually over port 554) and then ultimately HTTP-based streaming protocols, in line with industry trends favoring open standards and improved firewall compatibility.

MMS is largely legacy technology today, as Microsoft has deprecated its support in favor of Smooth Streaming and MPEG-DASH methods utilizing HTTP. However, port 1755 can still be indicative of old media servers or archival streaming applications still running in enterprise or media distribution networks.

Security Information

exposure of :1755

risk score

4/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

streaming averages 3.6 across 30 ports — this one sits 0.4 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

Common Vulnerabilities:

  • Lack of encryption and authentication mechanisms within the MMS protocol makes it susceptible to man-in-the-middle attacks, where traffic can be intercepted or altered.
  • Legacy support issues may expose outdated server software to buffer overflow vulnerabilities and other flaws exploitable by attackers.
  • The usage of UDP potentially exposes clients and servers to amplification and reflection DDoS attacks.

Common Mitigations:

  • Migrate away from MMS to modern, encrypted protocols like HTTPS-based streaming.
  • Restrict port 1755 exposure using firewalls and access control policies, allowing only trusted clients or internal networks.
  • Use deep packet inspection to detect and block unwanted or malicious streaming sessions.
  • Keep legacy streaming services patched, or better yet, decommissioned.
  • Employ TLS termination on a proxy if absolutely necessary to continue MMS usage while adding some encryption coverage.

Related Ports

all 30 in streaming →

the 8 most looked-up other ports in streaming — 30 ports carry that label.

portservicerisk
:8888GNUmp3d Streaming HTTPcaution
:8000Alternate HTTP / SHOUTcastcaution
:8880Windows Media SOAP Connectorcaution
:5001Slingboxcaution
:1220QTSS Adminsafe
:19294Google Talk Voice/Videocaution
:12013Audition Korea Servercaution
:9000SqueezeCentercaution

risk mix of the 8 listed

  • safe13%
  • caution88%

0 of 8 encrypted