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Environment: - On-prem network with firewall at 192.168.10.1. - Windows Server “Remote Access / RDP target” at 192.168.10.20. - In this environment, Domain Controller services and Remote Access/RDP services are combined on [login to view URL] (not best practice, but current state). Issue: - Users connect successfully to the network over VPN (SonicWall) and can reach the internal network. - VPN is stable and ICMP/ping to [login to view URL] succeeds. - RDP to [login to view URL] fails BEFORE any credential prompt / sign-in screen. - Observed error includes 0x904. This appears to fail at the RDP/NLA/handshake stage rather than authentication UI. What we believe: - SonicWall support indicated this is very likely NOT a firewall/VPN client issue and recommended capturing packets on the target server to confirm whether RDP connection attempts arrive and where handshake fails. Requested help: - Please assist troubleshooting Windows Server RDP handshake failure (NLA/Schannel/RDP security layer/GPO user rights/TermService/WFP). - We want to confirm: 1) Whether TCP 3389 SYN reaches the server during failed attempts, 2) If the server responds (SYN/ACK) and where negotiation stops (TLS/NLA/CredSSP), 3) Whether local policy/GPO rights (Allow log on through Remote Desktop Services), or Windows Defender Firewall/WFP is blocking pre-auth handshake.
Project ID: 40157397
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Hi there, I’d like to work with you on this one if possible! I have 16+ years of solid experience in Network and System Administration,Desktop and Technical Support. I can help you to fix this real quick .Thank you for considering my application. I look forward to hearing from you. Thanks, Muhammed Rafi
$75 USD in 1 day
7.7
7.7
17 freelancers are bidding on average $57 USD for this job

Having worked in the IT industry for over a decade now, I bring an extensive knowledge of network and system administration to the table. My proficiency finds a wide array of applications ranging from troubleshooting complex issues, like the RDP failure you're experiencing, to designing and implementing robust network infrastructures. I particularly understand the importance of best practices in such scenarios and design and recommend solutions accordingly. When it comes to your project, my skills lend well on various levels: Network Administration-wise to assess the TCP 3389 SYN reaching your server during failed attempts or the server responding and where negotiation stops; Network Security-wise to figure if local policy/GPO rights (Allow log on through Remote Desktop Services) or Windows Defender Firewall/WFP is blocking the pre-auth handshake; System Administration-wise to look into NLA/Schannel/RDP security layer/GPO user rights/TermService/WFP configuration What sets me apart from other freelancers is my unwavering dedication to complete projects within strict deadlines and my availability round-the-clock for any query or assistance you may need. Joining hands with me would not just ensure efficient troubleshooting but also a strong commitment towards 100% project delivery.I anticipate a favorable response that would provide an opportunity to put my passion-driven skills at work for you and solve your network woes effectively.
$30 USD in 1 day
7.2
7.2

Hi there, I am networking expert specialist and consultant for more than 11 years, who spend my free time to learn about new technologies in networking, security field to be always up to date. please just ping me on chat to have a short discussion on your project i will always look for solving your tasks ickly. below is a brief on my experience: Technology Specialist: --------------------- - Can design, implment large scale networking and make exaplanation reports. - Practice on Cisco Packet Tracer, GNS-3, EVE-NG. - Excellent pracitce on VMware WorkStation, Virtual-Box - VPN (IPSEC,IKE v1 or v2 ,L2TP ,OPENVPN, DUO Authentication). - Routing Protocols (BGP, OSPF, EIGRP .. ). - Wrie Technical Reports with excellent and format. Skills and Hands on Experience: ------------------------------- - Cisco devices (routers, switches), routing protocols, IPSEC, Cisco ASA Firewall. - Fortinet Devices: FortiGate, Forti Manager, Forti Analyzer. - wireless (WLC, Access Points): CISCO, Aruba, ubiquiti. - Juniper (M7, M10, MX 480, MX 960) and SRX (300, 500). - Operating Systems: Linux servers (Ubuntu, RedHAT, Debian), windows (Windows server 2012, 2016 ..etc). Regards, Ramy
$30 USD in 1 day
6.0
6.0

Hi there, I’m a Server Administrator with solid 7 years of hands-on experience in Remote Desktop Services. I have managed to solve complex RDS issues and would like to assist you troubleshooting your Windows Server RDP handshake failure. Please let me know a good time to discuss this. I hope to talk to you soon. Thank you! Here are a few Terminal Server projects I have worked on. https://www.freelancer.com/projects/performance-tuning/Windows-RDS-Setup/details https://www.freelancer.com/projects/windows-server/Windows-Server-RDS-Setup-39307568/details https://www.freelancer.com/projects/windows-server/Azure-RDS-RemoteApp-Configuration/details
$50 USD in 1 day
5.6
5.6

Hello, as a top-rated freelancer with extensive experience in Network Administration and System Admin, I am confident that I can successfully troubleshoot your Windows Server RDP handshake failure. My skills and familiarity with Microsoft’s suite including Active Directory, File Server, SSH, Remote Desktop Server, Windows Update Server, DNS Server, DHCP Server and Terminal Server are perfectly aligned with the requirements for this project. My Cisco and RedHat certifications further solidify my expertise in providing technical support for desktops, servers and various IT devices. Throughout my career, I have worked on several similar projects focusing on Windows server configuration, management, migration and troubleshooting. This has equipped me with a deep understanding of the underlying issues that can cause handshake failures like the one you're currently experiencing. Ultimately, thoroughness defines my troubleshooting approach. I’ll gladly inspect your network from top to bottom - from TCP 3389 SYN reaching the server to local policy/GPO rights and even ensuring Windows Defender Firewall/WFP isn't blocking anything. My commitment to precision will speed up the resolution process, allowing your team to regain access to RDP swiftly whilst minimizing any more downtime or frustration. Let's work together to addresses these hurdles head-on in a timely yet effective manner!
$30 USD in 1 day
5.3
5.3

Hello Dear! I write to introduce myself. I'm Engineer Toriqul Islam. I was born and grew up in Bangladesh. I speak and write in English like native people. I am a B.S.C. Engineer of Computer Science & Engineering. I completed my graduation from Rajshahi University of Engineering & Technology ( RUET). I love to work on Web Design & Development project. Web Design & development: I am a full-stack web developer with more than 10 years of experience. My design Approach is Always Modern and simple, which attracts people towards it. I have built websites for a wide variety of industries. I have worked with a lot of companies and built astonishing websites. All Clients have good reviews about me. Client Satisfaction is my first Priority. Technologies We Use: Custom Websites Development Using ======>Full Stack Development. 1. HTML5 2. CSS3 3. Bootstrap4 4. jQuery 5. JavaScript 6. Angular JS 7. React JS 8. Node JS 9. WordPress 10. PHP 11. Ruby on Rails 12. MYSQL 13. Laravel 14. .Net 15. CodeIgniter 16. React Native 17. SQL / MySQL 18. Mobile app development 19. Python 20. MongoDB What you'll get? • Fully Responsive Website on All Devices • Reusable Components • Quick response • Clean, tested and documented code • Completely met deadlines and requirements • Clear communication You are cordially welcome to discuss your project. Thank You! Best Regards, Toriqul Islam
$20 USD in 1 day
3.5
3.5

Hello, I’m an IT expert with over 20 years of experience in the industry. I hold certifications as a Cisco Certified Networking Professional (300-100 and 300-115), Linux Certified Professional (LPI 101, 102, 103), Red Hat Certified System Administrator, VMware Certified Professional (versions 4, 5, and 5.5), as well as being a Microsoft System Administrator/Engineer from 2003 to 2022 and AZ104
$100 USD in 1 day
3.5
3.5

As an experienced and highly skilled Python Developer & DevOps Engineer, I offer a unique blend of skills that make me an ideal fit for your Windows RDS Support project. Not only do I bring 4+ years of in-depth expertise in Python and Django, but I've also successfully managed Linux servers and handled complex automation tasks. Building on my extensive background in software development, I have substantial experience troubleshooting issues similar to yours. I regularly work with RESTful APIs and have deep knowledge of database systems, making me proficient in pinpointing problems in communication and resolving them swiftly and effectively. In addition to my core competencies, I'm adept at deploying applications on various cloud platforms such as AWS and DigitalOcean - a skill that will be valuable for you in ensuring seamless connectivity. My complete understanding of the intricacies involved in server security and performance optimization not only allows me to alleviate your current issue but also prevents future setbacks by implementing better practices. With me on board, you can rest assured that your Windows Server RDP handshake failure will be tackled promptly and thoroughly.
$25 USD in 1 day
2.8
2.8

Yes, this is absolutely within my expertise. This is a classic Windows Server RDP pre-authentication handshake failure (TLS/NLA), not a VPN issue. I can capture packets on the target server, identify exactly where the RDP negotiation breaks, and resolve it via policy, Schannel, or firewall/WFP configuration.
$50 USD in 1 day
2.4
2.4

I understand the problem clearly, The user couldn't able to connect a RPD session when connecting via VPN through SonicWALL. I can help you to resolve, if I get opportunity right here.
$20 USD in 1 day
0.0
0.0

I will troubleshoot and resolve the Windows Server RDP connection failure occurring before the credential prompt. The focus will be on the RDP handshake stage, including TCP connectivity, TLS/NLA/CredSSP negotiation, and local security policies. I will validate whether RDP traffic reaches the server and identify exactly where the connection is terminated. This work will confirm whether the root cause is related to Windows services, security layers, GPO, or local firewall/WFP rather than the VPN or perimeter firewall.
$10 USD in 1 day
0.0
0.0

I will support to fix this problem. Please check my detail IT. My LinkedIn is Muhammad Febrian wibowo
$20 USD in 7 days
0.0
0.0

This proposal outlines a plan to address a specific need or problem by implementing an effective and practical solution. The objective is to achieve measurable improvements through well-defined actions, efficient use of resources, and a structured timeline. The proposed approach focuses on quality, sustainability, and positive impact while minimizing risks and costs. By leveraging appropriate skills, tools, and strategies, this proposal aims to deliver reliable results that meet stakeholder expectations and support long-term goals.
$30 USD in 7 days
0.0
0.0

I can assist with troubleshooting this issue and guarantee the working within 3 working days. I have been in IT support and services since 2000 and has been doing these in very large setups. I have a team of qualified professionals in all domain to handle these support services with ease.
$223 USD in 4 days
0.0
0.0

Hi there. I can help you with that. Reach out to discuss it and get it fixed. I have done countless of complex troubleshooting, i am sure it wont be an issur. Cheers
$200 USD in 1 day
0.0
0.0

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