Registered · Cross-platform

17500 Dropbox LanSync

TCP Yes
UDP Yes
SCTP —
DCCP —

What it is

Dropbox LAN peer sync.

When / why

Local file-sync acceleration on the LAN.

Protocol status detail

TransportStatusMeaning
TCP Yes Assigned by IANA and standardized, specified, or widely used on this port.
UDP Yes Assigned by IANA and standardized, specified, or widely used on this port.
SCTP — Not applicable for this transport.
DCCP — Not applicable for this transport.
« 17472 Tanium 18080 Monero P2P »

Port range

Registered (1024–49151). Assigned by IANA on request; usable without elevated privileges on most systems.

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Firewall rules for port 17500

Copy-ready inbound rules for the active transports. Replace every <source> placeholder with the specific host, subnet, or CIDR that should reach this port.

ufw

sudo ufw allow proto tcp from <source> to any port 17500

Allow TCP 17500 (Dropbox LanSync). Replace <source> with the network/host that should reach it.

sudo ufw allow proto udp from <source> to any port 17500

Allow UDP 17500 (Dropbox LanSync). Replace <source> with the network/host that should reach it.

firewalld

sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<source>" port port="17500" protocol="tcp" accept'

Allow TCP 17500 (Dropbox LanSync) from <source>. Run 'firewall-cmd --reload' afterwards.

sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<source>" port port="17500" protocol="udp" accept'

Allow UDP 17500 (Dropbox LanSync) from <source>. Run 'firewall-cmd --reload' afterwards.

nftables

nft add rule inet filter input ip saddr <source> tcp dport 17500 accept

Allow TCP 17500 (Dropbox LanSync). Assumes table 'inet filter' with an 'input' chain.

nft add rule inet filter input ip saddr <source> udp dport 17500 accept

Allow UDP 17500 (Dropbox LanSync). Assumes table 'inet filter' with an 'input' chain.

iptables

sudo iptables -A INPUT -p tcp -s <source> --dport 17500 -j ACCEPT

Allow TCP 17500 (Dropbox LanSync). Persist with iptables-save/netfilter-persistent.

sudo iptables -A INPUT -p udp -s <source> --dport 17500 -j ACCEPT

Allow UDP 17500 (Dropbox LanSync). Persist with iptables-save/netfilter-persistent.

Azure NSG

az network nsg rule create -g <resource-group> --nsg-name <nsg> -n Allow-dropboxlansync-17500 --priority 1000 --access Allow --direction Inbound --protocol "*" --source-address-prefixes <source> --destination-port-ranges 17500

Inbound rule for 17500 (Dropbox LanSync). Set <source> to a CIDR; lower priority number = higher precedence.

AWS Security Group

aws ec2 authorize-security-group-ingress --group-id <sg-id> --ip-permissions IpProtocol=tcp,FromPort=17500,ToPort=17500,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound TCP 17500 (Dropbox LanSync). Replace <source-cidr> (e.g. 10.0.0.0/16).

aws ec2 authorize-security-group-ingress --group-id <sg-id> --ip-permissions IpProtocol=udp,FromPort=17500,ToPort=17500,IpRanges="[{CidrIp=<source-cidr>}]"

Inbound UDP 17500 (Dropbox LanSync). Replace <source-cidr> (e.g. 10.0.0.0/16).

GCP firewall

gcloud compute firewall-rules create allow-dropboxlansync-17500 --direction=INGRESS --action=ALLOW --rules=tcp:17500,udp:17500 --source-ranges=<source-cidr> --network=<network>

Ingress rule for 17500 (Dropbox LanSync). Scope with --source-ranges and optionally --target-tags.

Windows netsh

netsh advfirewall firewall add rule name="Allow Dropbox LanSync 17500/TCP" dir=in action=allow protocol=TCP localport=17500 remoteip=<source>

Inbound TCP 17500 (Dropbox LanSync). Set remoteip to a host/subnet; 'any' is discouraged.

netsh advfirewall firewall add rule name="Allow Dropbox LanSync 17500/UDP" dir=in action=allow protocol=UDP localport=17500 remoteip=<source>

Inbound UDP 17500 (Dropbox LanSync). Set remoteip to a host/subnet; 'any' is discouraged.

Windows PowerShell

New-NetFirewallRule -DisplayName "Allow Dropbox LanSync 17500/TCP" -Direction Inbound -Action Allow -Protocol TCP -LocalPort 17500 -RemoteAddress <source>

Inbound TCP 17500 (Dropbox LanSync). Replace <source> with a host or subnet.

New-NetFirewallRule -DisplayName "Allow Dropbox LanSync 17500/UDP" -Direction Inbound -Action Allow -Protocol UDP -LocalPort 17500 -RemoteAddress <source>

Inbound UDP 17500 (Dropbox LanSync). Replace <source> with a host or subnet.

Rules are generated only for transports marked active for this port. They default to an inbound allow with an explicit source placeholder — never any. Review direction, scope, and rule precedence before applying in production.