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How to fix ERR_UNSAFE_PORT error on Chrome when browsing to unsafe ports

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73

24

I'm getting this error when connecting to a web server on port 6666 (http://myserver:6666/):

Error 312 (net::ERR_UNSAFE_PORT): Unknown error.

Is there an easy way to resolve this without rebuilding Chrome from source?

google-chrome

share|improve this question

edited Sep 13 '10 at 12:35

ripper234

asked Sep 13 '10 at 9:40

ripper234ripper234

4,4133073105

add a comment | 

73

24

I'm getting this error when connecting to a web server on port 6666 (http://myserver:6666/):

Error 312 (net::ERR_UNSAFE_PORT): Unknown error.

Is there an easy way to resolve this without rebuilding Chrome from source?

google-chrome

share|improve this question

edited Sep 13 '10 at 12:35

ripper234

asked Sep 13 '10 at 9:40

ripper234ripper234

4,4133073105

add a comment | 

I'm getting this error when connecting to a web server on port 6666 (http://myserver:6666/):

Error 312 (net::ERR_UNSAFE_PORT): Unknown error.

Is there an easy way to resolve this without rebuilding Chrome from source?

google-chrome

share|improve this question

edited Sep 13 '10 at 12:35

ripper234

asked Sep 13 '10 at 9:40

ripper234ripper234

4,4133073105

share|improve this question

edited Sep 13 '10 at 12:35

ripper234

asked Sep 13 '10 at 9:40

ripper234ripper234

4,4133073105

share|improve this question

edited Sep 13 '10 at 12:35

ripper234

asked Sep 13 '10 at 9:40

ripper234ripper234

4,4133073105

asked Sep 13 '10 at 9:40

ripper234ripper234

4,4133073105

asked Sep 13 '10 at 9:40

ripper234ripper234

4,4133073105

7 Answers
7

active

oldest

votes

68

On Windows:

Right Click on Chrome shortcut >> Properties >>

Then Append
--explicitly-allowed-ports=xxx to shortcut target

Example:

C:Documents and SettingsUserLocal
SettingsApplication
DataGoogleChromeApplicationchrome.exe
--explicitly-allowed-ports=6666

Resource from here

share|improve this answer

edited Sep 14 '16 at 13:28

Greg Dubicki

23528

answered Sep 13 '10 at 10:03

subankisubanki

5,94173246

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I missed this answer, thanks. I opened a separate question to understand which ports are safe/blocked by default: superuser.com/questions/188058/…
  
  – ripper234
  Sep 13 '10 at 12:36
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  This answer is excellent... for Windows. It won't solve the problem for (for example) Mac.
  
  – Chris R
  May 3 '12 at 17:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ChrisR: Why? Does the --explicitly-allowed-ports switch not exist for Mac?
  
  – Dennis
  May 3 '12 at 17:35
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Adding command line flags on the mac is a pain in the ass; if you add them to the app bundle they often get nuked in upgrades.
  
  – Chris R
  May 3 '12 at 17:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ChrisR: You should consider adding this to your question.
  
  – Dennis
  May 3 '12 at 17:44
  

  
  
  
  

add a comment | 

17

You may be able to turn this off in Google Chrome, but you do so at your own risk. There is actually a good security reason why Chrome blocks these ports: Basically you open your browser up to being an open proxy for attackers to use to attack other services on your network.

For more information: Why does Chrome consider some ports unsafe?

share|improve this answer

edited Jun 27 '17 at 13:46

answered Aug 23 '12 at 7:42

James RoperJames Roper

55956

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Why just making an HTTP request on a non standard port it is said to "open" the browser to being an open proxy to attack services in local network? Open how??
  
  – jj_
  Jul 22 '16 at 19:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If it is left unchecked then any malicious code can make request to URLs with arbitrary ports. It might not be an optimal solution but by blocking other ports you are only leaving attackers with 80 & 443 to exploit.
  
  – Willa
  Jan 23 '17 at 14:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the referenced link is now dead
  
  – Jeff Puckett
  Jun 13 '17 at 15:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Link is now dead. Wayback Machine: web.archive.org/web/20170216040700/https://jazzy.id.au/2012/08/… (suggested edit)
  
  – Nulano
  Jun 26 '17 at 17:54
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Link is now fixed on the server (server had an incorrectly configured timezone causing it to serve the blog post at the wrong date).
  
  – James Roper
  Jun 27 '17 at 13:47
  

  
  
  
  

add a comment | 

7

On Mac you can create an app launching Chrome with parameters mentioned in other answers using Automator built-in Apple application:

1. Launch Automator




2. As "Type of document" choose "Application"




3. Add action "Run shell script"




4. Replace placeholder cat script in this action with:

/Applications/Google Chrome.app/Contents/MacOS/Google Chrome --explicitly-allowed-ports=5000,6000,7000

5. Save the created app as something like "Google Chrome with allowed unsafe ports" in your Application folder




6. Use this new app instead of Google Chrome directly




7. (optional) Replace default icon of the created "app" - Automator's robot - with Chrome's using this method (note: upvote that answer if you like it!)

Source: http://cubewot.de/node/266

share|improve this answer

edited Apr 13 '17 at 12:45

Community♦

1

answered Apr 14 '16 at 10:26

GeorgeGeorge

17015

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This picture does not have the full path. It is automating the execution of a directory.
  
  – ojblass
  Sep 19 '18 at 4:27
  

  
  
  
  

add a comment | 

4

For Mac:

/Applications/Google Chrome.app/Contents/MacOS/Google Chrome --explicitly-allowed-ports=5000,6000,7000

for ports 5000, 6000, and 7000.

share|improve this answer

answered Aug 21 '15 at 16:19

JayJay

1413

add a comment | 

3

As subanki said, you've got to add the -explicitly-allowed-ports option to your Chrome startup command.

In Ubuntu you can do this (as root) by editing the "google-chrome" script under your Chrome installation folder

You can get the directory by typing:

ls -la /usr/bin | grep chrome

Then, edit the "google-chrome" file adding the mentioned switch to the EXEC line:

exec -a "$0" "$HERE/chrome" "-explicitly-allowed-ports=6000" "$@"

Just change "6000" with the comma separated values you might need (example: -explicitly-allowed-ports=5000,6000,7000)

NOTE: for UNIX, the switch does NOT start with "--", it does with a single "-"

share|improve this answer

edited Jan 7 '14 at 9:16

Andrea

1,43631316

answered Jan 7 '14 at 7:57

SpinoSpino

311

add a comment | 

0

Here is the correct answer for those of you who are developers using node.js as a web server

Change the port you are using to host your web pages.

For example

if you typed into command line node index.js & pressed enter,

if it started running on port 22 for 80 http request,

when you visit the website at port 22,

the chrome browser with throw this error page.,br>
keyword UNSAFE PORT means port needs to match the content.

Thank you.

share|improve this answer

answered Mar 7 '18 at 22:27

jehovahsaysjehovahsays

1186

add a comment | 

0

I still get error

http://localhost:6000/upload net::ERR_UNSAFE_PORT

after starting chrome using automator...any ideas why?

share

answered 5 mins ago

Lucas FrancoLucas Franco

1

New contributor

Lucas Franco is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

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68

On Windows:

Right Click on Chrome shortcut >> Properties >>

Then Append
--explicitly-allowed-ports=xxx to shortcut target

Example:

C:Documents and SettingsUserLocal
SettingsApplication
DataGoogleChromeApplicationchrome.exe
--explicitly-allowed-ports=6666

Resource from here

share|improve this answer

edited Sep 14 '16 at 13:28

Greg Dubicki

23528

answered Sep 13 '10 at 10:03

subankisubanki

5,94173246

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I missed this answer, thanks. I opened a separate question to understand which ports are safe/blocked by default: superuser.com/questions/188058/…
  
  – ripper234
  Sep 13 '10 at 12:36
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  This answer is excellent... for Windows. It won't solve the problem for (for example) Mac.
  
  – Chris R
  May 3 '12 at 17:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ChrisR: Why? Does the --explicitly-allowed-ports switch not exist for Mac?
  
  – Dennis
  May 3 '12 at 17:35
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Adding command line flags on the mac is a pain in the ass; if you add them to the app bundle they often get nuked in upgrades.
  
  – Chris R
  May 3 '12 at 17:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ChrisR: You should consider adding this to your question.
  
  – Dennis
  May 3 '12 at 17:44
  

  
  
  
  

add a comment | 

68

On Windows:

Right Click on Chrome shortcut >> Properties >>

Then Append
--explicitly-allowed-ports=xxx to shortcut target

Example:

C:Documents and SettingsUserLocal
SettingsApplication
DataGoogleChromeApplicationchrome.exe
--explicitly-allowed-ports=6666

Resource from here

share|improve this answer

edited Sep 14 '16 at 13:28

Greg Dubicki

23528

answered Sep 13 '10 at 10:03

subankisubanki

5,94173246

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I missed this answer, thanks. I opened a separate question to understand which ports are safe/blocked by default: superuser.com/questions/188058/…
  
  – ripper234
  Sep 13 '10 at 12:36
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  This answer is excellent... for Windows. It won't solve the problem for (for example) Mac.
  
  – Chris R
  May 3 '12 at 17:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ChrisR: Why? Does the --explicitly-allowed-ports switch not exist for Mac?
  
  – Dennis
  May 3 '12 at 17:35
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Adding command line flags on the mac is a pain in the ass; if you add them to the app bundle they often get nuked in upgrades.
  
  – Chris R
  May 3 '12 at 17:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ChrisR: You should consider adding this to your question.
  
  – Dennis
  May 3 '12 at 17:44
  

  
  
  
  

add a comment | 

On Windows:

Right Click on Chrome shortcut >> Properties >>

Then Append
--explicitly-allowed-ports=xxx to shortcut target

Example:

C:Documents and SettingsUserLocal
SettingsApplication
DataGoogleChromeApplicationchrome.exe
--explicitly-allowed-ports=6666

Resource from here

share|improve this answer

edited Sep 14 '16 at 13:28

Greg Dubicki

23528

answered Sep 13 '10 at 10:03

subankisubanki

5,94173246

share|improve this answer

edited Sep 14 '16 at 13:28

Greg Dubicki

23528

answered Sep 13 '10 at 10:03

subankisubanki

5,94173246

edited Sep 14 '16 at 13:28

Greg Dubicki

23528

edited Sep 14 '16 at 13:28

Greg Dubicki

23528

answered Sep 13 '10 at 10:03

subankisubanki

5,94173246

answered Sep 13 '10 at 10:03

subankisubanki

5,94173246

17

You may be able to turn this off in Google Chrome, but you do so at your own risk. There is actually a good security reason why Chrome blocks these ports: Basically you open your browser up to being an open proxy for attackers to use to attack other services on your network.

For more information: Why does Chrome consider some ports unsafe?

share|improve this answer

edited Jun 27 '17 at 13:46

answered Aug 23 '12 at 7:42

James RoperJames Roper

55956

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Why just making an HTTP request on a non standard port it is said to "open" the browser to being an open proxy to attack services in local network? Open how??
  
  – jj_
  Jul 22 '16 at 19:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If it is left unchecked then any malicious code can make request to URLs with arbitrary ports. It might not be an optimal solution but by blocking other ports you are only leaving attackers with 80 & 443 to exploit.
  
  – Willa
  Jan 23 '17 at 14:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the referenced link is now dead
  
  – Jeff Puckett
  Jun 13 '17 at 15:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Link is now dead. Wayback Machine: web.archive.org/web/20170216040700/https://jazzy.id.au/2012/08/… (suggested edit)
  
  – Nulano
  Jun 26 '17 at 17:54
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Link is now fixed on the server (server had an incorrectly configured timezone causing it to serve the blog post at the wrong date).
  
  – James Roper
  Jun 27 '17 at 13:47
  

  
  
  
  

add a comment | 

17

You may be able to turn this off in Google Chrome, but you do so at your own risk. There is actually a good security reason why Chrome blocks these ports: Basically you open your browser up to being an open proxy for attackers to use to attack other services on your network.

For more information: Why does Chrome consider some ports unsafe?

share|improve this answer

edited Jun 27 '17 at 13:46

answered Aug 23 '12 at 7:42

James RoperJames Roper

55956

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Why just making an HTTP request on a non standard port it is said to "open" the browser to being an open proxy to attack services in local network? Open how??
  
  – jj_
  Jul 22 '16 at 19:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If it is left unchecked then any malicious code can make request to URLs with arbitrary ports. It might not be an optimal solution but by blocking other ports you are only leaving attackers with 80 & 443 to exploit.
  
  – Willa
  Jan 23 '17 at 14:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the referenced link is now dead
  
  – Jeff Puckett
  Jun 13 '17 at 15:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Link is now dead. Wayback Machine: web.archive.org/web/20170216040700/https://jazzy.id.au/2012/08/… (suggested edit)
  
  – Nulano
  Jun 26 '17 at 17:54
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Link is now fixed on the server (server had an incorrectly configured timezone causing it to serve the blog post at the wrong date).
  
  – James Roper
  Jun 27 '17 at 13:47
  

  
  
  
  

add a comment | 

You may be able to turn this off in Google Chrome, but you do so at your own risk. There is actually a good security reason why Chrome blocks these ports: Basically you open your browser up to being an open proxy for attackers to use to attack other services on your network.

For more information: Why does Chrome consider some ports unsafe?

share|improve this answer

edited Jun 27 '17 at 13:46

answered Aug 23 '12 at 7:42

James RoperJames Roper

55956

share|improve this answer

edited Jun 27 '17 at 13:46

answered Aug 23 '12 at 7:42

James RoperJames Roper

55956

answered Aug 23 '12 at 7:42

James RoperJames Roper

55956

answered Aug 23 '12 at 7:42

James RoperJames Roper

55956

7

On Mac you can create an app launching Chrome with parameters mentioned in other answers using Automator built-in Apple application:

1. Launch Automator




2. As "Type of document" choose "Application"




3. Add action "Run shell script"




4. Replace placeholder cat script in this action with:

/Applications/Google Chrome.app/Contents/MacOS/Google Chrome --explicitly-allowed-ports=5000,6000,7000

5. Save the created app as something like "Google Chrome with allowed unsafe ports" in your Application folder




6. Use this new app instead of Google Chrome directly




7. (optional) Replace default icon of the created "app" - Automator's robot - with Chrome's using this method (note: upvote that answer if you like it!)

Source: http://cubewot.de/node/266

share|improve this answer

edited Apr 13 '17 at 12:45

Community♦

1

answered Apr 14 '16 at 10:26

GeorgeGeorge

17015

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This picture does not have the full path. It is automating the execution of a directory.
  
  – ojblass
  Sep 19 '18 at 4:27
  

  
  
  
  

add a comment | 

7

On Mac you can create an app launching Chrome with parameters mentioned in other answers using Automator built-in Apple application:

1. Launch Automator




2. As "Type of document" choose "Application"




3. Add action "Run shell script"




4. Replace placeholder cat script in this action with:

/Applications/Google Chrome.app/Contents/MacOS/Google Chrome --explicitly-allowed-ports=5000,6000,7000

5. Save the created app as something like "Google Chrome with allowed unsafe ports" in your Application folder




6. Use this new app instead of Google Chrome directly




7. (optional) Replace default icon of the created "app" - Automator's robot - with Chrome's using this method (note: upvote that answer if you like it!)

Source: http://cubewot.de/node/266

share|improve this answer

edited Apr 13 '17 at 12:45

Community♦

1

answered Apr 14 '16 at 10:26

GeorgeGeorge

17015

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This picture does not have the full path. It is automating the execution of a directory.
  
  – ojblass
  Sep 19 '18 at 4:27
  

  
  
  
  

add a comment | 

On Mac you can create an app launching Chrome with parameters mentioned in other answers using Automator built-in Apple application:

1. Launch Automator




2. As "Type of document" choose "Application"




3. Add action "Run shell script"




4. Replace placeholder cat script in this action with:

/Applications/Google Chrome.app/Contents/MacOS/Google Chrome --explicitly-allowed-ports=5000,6000,7000

5. Save the created app as something like "Google Chrome with allowed unsafe ports" in your Application folder




6. Use this new app instead of Google Chrome directly




7. (optional) Replace default icon of the created "app" - Automator's robot - with Chrome's using this method (note: upvote that answer if you like it!)

Source: http://cubewot.de/node/266

share|improve this answer

edited Apr 13 '17 at 12:45

Community♦

1

answered Apr 14 '16 at 10:26

GeorgeGeorge

17015

share|improve this answer

edited Apr 13 '17 at 12:45

Community♦

1

answered Apr 14 '16 at 10:26

GeorgeGeorge

17015

edited Apr 13 '17 at 12:45

Community♦

1

edited Apr 13 '17 at 12:45

Community♦

1

answered Apr 14 '16 at 10:26

GeorgeGeorge

17015

answered Apr 14 '16 at 10:26

GeorgeGeorge

17015

4

For Mac:

/Applications/Google Chrome.app/Contents/MacOS/Google Chrome --explicitly-allowed-ports=5000,6000,7000

for ports 5000, 6000, and 7000.

share|improve this answer

answered Aug 21 '15 at 16:19

JayJay

1413

add a comment | 

4

For Mac:

/Applications/Google Chrome.app/Contents/MacOS/Google Chrome --explicitly-allowed-ports=5000,6000,7000

for ports 5000, 6000, and 7000.

share|improve this answer

answered Aug 21 '15 at 16:19

JayJay

1413

add a comment | 

For Mac:

/Applications/Google Chrome.app/Contents/MacOS/Google Chrome --explicitly-allowed-ports=5000,6000,7000

for ports 5000, 6000, and 7000.

share|improve this answer

answered Aug 21 '15 at 16:19

JayJay

1413

/Applications/Google Chrome.app/Contents/MacOS/Google Chrome --explicitly-allowed-ports=5000,6000,7000

share|improve this answer

answered Aug 21 '15 at 16:19

JayJay

1413

answered Aug 21 '15 at 16:19

JayJay

1413

answered Aug 21 '15 at 16:19

JayJay

1413

3

As subanki said, you've got to add the -explicitly-allowed-ports option to your Chrome startup command.

In Ubuntu you can do this (as root) by editing the "google-chrome" script under your Chrome installation folder

You can get the directory by typing:

ls -la /usr/bin | grep chrome

Then, edit the "google-chrome" file adding the mentioned switch to the EXEC line:

exec -a "$0" "$HERE/chrome" "-explicitly-allowed-ports=6000" "$@"

Just change "6000" with the comma separated values you might need (example: -explicitly-allowed-ports=5000,6000,7000)

NOTE: for UNIX, the switch does NOT start with "--", it does with a single "-"

share|improve this answer

edited Jan 7 '14 at 9:16

Andrea

1,43631316

answered Jan 7 '14 at 7:57

SpinoSpino

311

add a comment | 

3

As subanki said, you've got to add the -explicitly-allowed-ports option to your Chrome startup command.

In Ubuntu you can do this (as root) by editing the "google-chrome" script under your Chrome installation folder

You can get the directory by typing:

ls -la /usr/bin | grep chrome

Then, edit the "google-chrome" file adding the mentioned switch to the EXEC line:

exec -a "$0" "$HERE/chrome" "-explicitly-allowed-ports=6000" "$@"

Just change "6000" with the comma separated values you might need (example: -explicitly-allowed-ports=5000,6000,7000)

NOTE: for UNIX, the switch does NOT start with "--", it does with a single "-"

share|improve this answer

edited Jan 7 '14 at 9:16

Andrea

1,43631316

answered Jan 7 '14 at 7:57

SpinoSpino

311

add a comment | 

As subanki said, you've got to add the -explicitly-allowed-ports option to your Chrome startup command.

In Ubuntu you can do this (as root) by editing the "google-chrome" script under your Chrome installation folder

You can get the directory by typing:

ls -la /usr/bin | grep chrome

Then, edit the "google-chrome" file adding the mentioned switch to the EXEC line:

exec -a "$0" "$HERE/chrome" "-explicitly-allowed-ports=6000" "$@"

Just change "6000" with the comma separated values you might need (example: -explicitly-allowed-ports=5000,6000,7000)

NOTE: for UNIX, the switch does NOT start with "--", it does with a single "-"

share|improve this answer

edited Jan 7 '14 at 9:16

Andrea

1,43631316

answered Jan 7 '14 at 7:57

SpinoSpino

311

ls -la /usr/bin | grep chrome

exec -a "$0" "$HERE/chrome" "-explicitly-allowed-ports=6000" "$@"

share|improve this answer

edited Jan 7 '14 at 9:16

Andrea

1,43631316

answered Jan 7 '14 at 7:57

SpinoSpino

311

edited Jan 7 '14 at 9:16

Andrea

1,43631316

edited Jan 7 '14 at 9:16

Andrea

1,43631316

answered Jan 7 '14 at 7:57

SpinoSpino

311

answered Jan 7 '14 at 7:57

SpinoSpino

311