Document:

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                                                                    Exhibit 10.8

                     AMENDMENT NO. 2 TO SERIES C CONVERTIBLE
                            STOCK PURCHASE AGREEMENT

     THIS AMENDMENT NO. 2 TO SERIES C CONVERTIBLE STOCK PURCHASE AGREEMENT dated
as of January 10, 2002 (this "Amendment"), is made and entered into by and among
UBS CAPITAL AMERICAS III, L.P., a Jersey, Channel Islands limited partnership
("Americas"), UBS CAPITAL LLC, a Delaware limited liability company ("UBS
Capital" and together with Americas, the "Purchasers") and IFX CORPORATION, a
Delaware corporation (the "Company").

                                    RECITALS

     WHEREAS, Purchasers and the Company are parties to that certain Series C
Convertible Stock Purchase Agreement dated as of October 11, 2001, as amended by
Amendment No. 1 to Series C Convertible Stock Purchase Agreement dated as of
December 10, 2001 (as so amended, the "Purchase Agreement"); and

     WHEREAS, the Company and Purchasers desire to further amend the Purchase
Agreement as set forth below, which amendment has been approved by the Board of
Directors of the Company.

     NOW, THEREFORE, for valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties hereto agree as follows:

     1.  Termination Date. Section 10(b) of the Purchase Agreement is amended by
         deleting the number "90" and substituting the number "120" therefor.

     2.  Counterparts. This Amendment may be executed in one or more
         counterparts and all such counterparts shall be deemed an original,
         shall be construed together and shall constitute one and the same
         instrument.

     3.  Choice of Law. This Amendment shall be governed by and construed in
         accordance with the laws of the State of New York without regard to the
         conflicts of law provisions thereof.

     4.  Defined Terms. Capitalized terms used and not defined herein shall have
         the meanings ascribed to such terms in the Purchase Agreement.

     5.  Continuance of Purchase Agreement. Except as provided herein, the terms
         of the Purchase Agreement shall continue in full force and effect.

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Amendment as of the first date written above.

                            IFX CORPORATION

                            By: /s/ Joel Eidelstein
                                ------------------------------------
                                Name:  Joel Eidelstein
                                Title: President

                            UBS CAPITAL AMERICAS III, L.P.

                            By: UBS CAPITAL AMERICAS III, LLC

                                By: /s/ Mark O. Lama
                                    --------------------------------
                                    Name:  Mark O. Lama
                                    Title: Principal

                                By: /s/ Marc Unger
                                    --------------------------------
                                    Name:  Marc Unger
                                    Title: Chief Financial Officer

                            UBS CAPITAL LLC

                            By: /s/ Mark Lama
                                ------------------------------------
                                Name:  Mark Lama
                                Title: Attorney-in-fact

                            By: /s/ Marc Unger
                                ------------------------------------
                                Name:  Marc Unger
                                Title: Attorney-in-fact

                                      -2-<PAGE>

                                                                    Exhibit 10.9

                     AMENDMENT NO. 1 TO SERIES D CONVERTIBLE
                            STOCK PURCHASE AGREEMENT

     THIS AMENDMENT NO. 1 TO SERIES D CONVERTIBLE STOCK PURCHASE AGREEMENT dated
as of April 19, 2002 (this "Amendment"), is made and entered into by and among
UBS CAPITAL AMERICAS III, L.P., a Jersey, Channel Islands limited partnership
("Americas"), UBS CAPITAL LLC, a Delaware limited liability company ("UBS
Capital"), International Technology Investment LC ("ITI"), LSC, LLC ("LSC") and
Jak Bursztyn ("Bursztyn") (collectively, Americas, UBS Capital, ITI, LSC and
Bursztyn are referred to as the "Purchasers") and IFX CORPORATION, a Delaware
corporation (the "Company").

                                    RECITALS

     WHEREAS, Purchasers and the Company are parties to that certain Series D
Convertible Stock Purchase Agreement dated as of February 19, 2002 (the
"Purchase Agreement"); and

     WHEREAS, the Company and Purchasers desire to amend the Purchase Agreement
as set forth below, which amendment has been approved by the Board of Directors
of the Company.

     NOW, THEREFORE, for valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties hereto agree as follows:

     1.   Termination Date. Section 10(b) of the Purchase Agreement is amended
          by deleting the phrase "the date which is 60 days from the date
          hereof" and substituting the phrase "May 31, 2002" therefor.

     2.   Counterparts. This Amendment may be executed in one or more
          counterparts and all such counterparts shall be deemed an original,
          shall be construed together and shall constitute one and the same
          instrument.

     3.   Choice of Law. This Amendment shall be governed by and construed in
          accordance with the laws of the State of New York without regard to
          the conflicts of law provisions thereof.

     4.   Defined Terms. Capitalized terms used and not defined herein shall
          have the meanings ascribed to such terms in the Purchase Agreement.

     5.   Continuance of Purchase Agreement. Except as provided herein, the
          terms of the Purchase Agreement shall continue in full force and
          effect.

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Amendment as of the first date written above.

                                   IFX CORPORATION

                                   By:  /s/ Joel Eidelstein
                                        ---------------------------------------
                                        Name:  Joel Eidelstein
                                        Title: President

                                   UBS CAPITAL AMERICAS III, L.P.

                                   By:  UBS CAPITAL AMERICAS III, LLC

                                        By:  /s/ Mark Lama
                                             ----------------------------------
                                             Name:  Mark Lama
                                             Title: Principal

                                        By:  /s/ Marc Unger
                                             ----------------------------------
                                             Name:  Marc Unger
                                             Title: Chief Financial Officer

                                   UBS CAPITAL LLC

                                   By:  /s/ Mark Lama
                                        ---------------------------------------
                                        Name:  Mark Lama
                                        Title: Attorney-in-fact

                                   By:  /s/ Marc Unger
                                        ---------------------------------------
                                        Name:  Marc Unger
                                        Title: Attorney-in-fact

                                   INTERNATIONAL TECHNOLOGY INVESTMENTS, LC

                                   By:  /s/ Michael Shalom
                                        ---------------------------------------
                                        Michael Shalom, Manager

                                      -2-

<PAGE>

                                        /s/ Jak Bursztyn
                                        ----------------------------------------
                                        Jak Bursztyn

                                   LSC, LLC

                                   By:  /s/ Lee S. Casty
                                        ---------------------------------------
                                        Lee S. Casty
                                        Title: Manager

                                      -3-<PAGE>

                                                                   Exhibit 10.10

                     AMENDMENT NO. 2 TO SERIES D CONVERTIBLE
                            STOCK PURCHASE AGREEMENT

     THIS AMENDMENT NO. 2 TO SERIES D CONVERTIBLE STOCK PURCHASE AGREEMENT dated
as of May 30, 2002 (this "Amendment"), is made and entered into by and among UBS
CAPITAL AMERICAS III, L.P., a Jersey, Channel Islands limited partnership
("Americas"), UBS CAPITAL LLC, a Delaware limited liability company ("UBS
Capital"), International Technology Investment LC ("ITI"), LSC, LLC ("LSC") and
Jak Bursztyn ("Bursztyn") (collectively, Americas, UBS Capital, ITI, LSC and
Bursztyn are referred to as the "Purchasers") and IFX CORPORATION, a Delaware
corporation (the "Company").

                                    RECITALS

     WHEREAS, Purchasers and the Company are parties to that certain Series D
Convertible Stock Purchase Agreement dated as of February 19, 2002, as amended
by Amendment No. 1 to Series D Stock Purchase Agreement dated as of April 19,
2002 (as so amended, the "Purchase Agreement"); and

     WHEREAS, the Company and Purchasers desire to amend the Purchase Agreement
as set forth below, which amendment has been approved by the Board of Directors
of the Company.

     NOW, THEREFORE, for valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties hereto agree as follows:

     1.   Termination Date. Section 10(b) of the Purchase Agreement is amended
          by deleting the phrase "May 31, 2002" and substituting the phrase
          "June 30, 2002" therefor.

     2.   Counterparts. This Amendment may be executed in one or more
          counterparts and all such counterparts shall be deemed an original,
          shall be construed together and shall constitute one and the same
          instrument.

     3.   Choice of Law. This Amendment shall be governed by and construed in
          accordance with the laws of the State of New York without regard to
          the conflicts of law provisions thereof.

     4.   Defined Terms. Capitalized terms used and not defined herein shall
          have the meanings ascribed to such terms in the Purchase Agreement.

     5.   Continuance of Purchase Agreement. Except as provided herein, the
          terms of the Purchase Agreement shall continue in full force and
          effect.

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Amendment as of the first date written above.

                                   IFX CORPORATION

                                   By:  /s/ Joel Eidelstein
                                        ---------------------------------------
                                        Name:  Joel Eidelstein
                                        Title: President

                                   UBS CAPITAL AMERICAS III, L.P.

                                   By:  UBS CAPITAL AMERICAS III, LLC

                                        By:  /s/ Mark Lama
                                             ----------------------------------
                                             Name:  Mark Lama
                                             Title: Principal

                                        By:  /s/ Marc Unger
                                             ----------------------------------
                                             Name:  Marc Unger
                                             Title: Chief Financial Officer

                                   UBS CAPITAL LLC

                                   By:  /s/ Mark Lama
                                        ---------------------------------------
                                        Name:  Mark Lama
                                        Title: Attorney-in-fact

                                   By:  /s/ Marc Unger
                                        ---------------------------------------
                                        Name:  Marc Unger
                                        Title: Attorney-in-fact

                                   INTERNATIONAL TECHNOLOGY INVESTMENTS, LC

                                   By:  /s/ Michael Shalom
                                        ---------------------------------------
                                        Michael Shalom, Manager

                                      -2-

<PAGE>

                                    /s/ Jak Bursztyn
                                    -------------------------------------------
                                    Jak Bursztyn

                                    LSC, LLC

                                    By:  /s/ Lee S. Casty
                                         --------------------------------------
                                         Lee S. Casty
                                         Title: Manager

                                      -3-

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