Allow Firefox & Chrome To Access Restricted Ports

Read Time:1 Min, 42 Sec

When separating WebLogic E1 JAS instances we usually end up using odd port numbers. Sometimes, we use ports that have been put on a restricted list by both Firefox and Chrome.

Below is a list of the ports that are blocked and the service that is the reason for it being blocked:

1 – tcpmux	7 – echo	9 – discard	11 – systat
13 – daytime	15 – netstat	17 – qotd	19 – chargen
20 – ftp data	21 – ftp control	22 – ssh	23 – telnet
25 – smtp	37 – time	42 – name	43 – nicname
53 – domain	77 – priv-rjs	79 – finger	87 – ttylink
95 – supdup	101 – hostriame	102 – iso-tsap	103 – gppitnp
104 – acr-nema	109 – POP2	110 – POP3	111 – sunrpc
113 – auth	115 – sftp	117 – uucp-path	119 – NNTP
123 – NTP	135 – loc-srv / epmap	139 – netbios	143 – IMAP2
179 – BGP	389 – LDAP	465 – SMTP+SSL	512 – print / exec
513 – login	514 – shell	515 – printer	526 – tempo
530 – courier	531 – chat	532 – netnews	540 – uucp
556 – remotefs	563 – NNTP+SSL	587 – submission	601 – syslog
636 – LDAP+SSL	993 – IMAP+SSL	995 – POP3+SSL	2049 – nfs
4045 – lockd	6000 – X11

For more detail about this you can visit Mozilla’s website.

We ended up using ports 81-89. As you can see in the table above, port 87 is listed because of a service called “ttylink“. Below are the steps that you can take to “whitelist” any port you want. However, I would recommend not using the list of restricted ports. It is much easier than going through these steps with all of your users or maintaining a Windows Group PolicyWindows Group Policy.

Firefox:

Type the following URL into Firefox: about:config
Create a string setting called: network.security.ports.banned.override
Give your new setting a value of “87”. You can also include a comma separated list, a range or a combination of both: 87, 150-300, 350, 400, 450-500

Chrome:

Modify your shortcut to Chrome by changing the “Target” field to look something like:
“C:\Program Files (x86)\Google\Chrome\Application\chrome.exe”
–explicitly-allowed-ports=87

Author

Stewart Schatz

Career: Principal CNC Consultant for Syntax Systems Limited specializing Oracle JD Edwards EnterpriseOne and the technology that supports it. Side Hustle: Owner/Operator of E1Tips.com Location: Lancaster, PA USA What I like to do: Invest in Family, Explore Technology, Lead Teams, Share Knowledge/Experience, Hunt, Hike, etc.

stewart@9rains.com

http://stewartschatz.com